How Much Should a 6-Month Old Weigh?

I have a now seven-month-old boy, who started crawling four days before his seven-month birthday. At six-month appointment, he weighed 17 pounds and 14 oz. I am guessing he weighs in the 18 pound, couple of oz’s range. Is this normal or is it too low? I hear of some six-month-old babies that are 20 pounds or more. He is rather long, maybe about 28 inches plus.
Ashley

How Much Should a 6-Month Old Weigh?

Dr. Greene’s Answer:

Ashley, healthy babies come in many shapes and sizes. At six months, anywhere between 14 and 21 pounds is considered a healthy weight for boys. (Although, five percent of healthy boys weigh less than 14 pounds and five percent of healthy boys weight more than 21 pounds). Healthy boys who are 28 inches long, whatever their age, usually weigh 16 to 22 pounds. So 17 or 18 pounds is a great weight for an active boy to be!

Most adults who are reading this would rather they were on the slim, active side of their ideal weight range! Ashley, it sounds like you have a wonderful son, off to a great start. And it sounds like your crawling son has some exciting adventures and discoveries ahead.

Dr. Alan Greene

Dr. Greene is the founder of DrGreene.com (cited by the AMA as “the pioneer physician Web site”), a practicing pediatrician, father of four, & author of Raising Baby Green & Feeding Baby Green. He appears frequently in the media including such venues as the The New York Times, the TODAY Show, Good Morning America, & the Dr. Oz Show.

  1. Magdaline

    My baby girl is 5 months 10 days. She looks very healthy and she is always very active and playful. The only problem is that she just weighed 5.2 Kgs. Is her growth okay? Is healthy? Kindly, I need your quick advice.

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  2. Kirsty

    My girl will be 6 months tomorrow. She was 13lbs 5 at 5 months so I’m guessing she’ll be around 13lbs 12 now. She’s a greedy so and so but still sticks to her 9th centile line. You have absolutely nothing to worry about! :)

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  3. Maria

    Hi, my baby girl just turned 4 months and her weight is 22 pounds she still wakes up every 2 hours for her feedings… I am so sleep deprived but my doctor is fine with her weight…she is such a butter. Ball … Shes already wearing some 12 month old clothes…

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  4. Marie

    Hi, my baby girl is 7 months old, she weights about 17 pounds and is 69cm long. She eats breastmilk + formula + solides since she turn 6 months old. She only takes 4oz bottles, even before formula and solids. All my friends babies and on the internet mum’s blog, says their babies eat around 6 to 8oz bottles. Should i be worried???

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  5. Amand

    My baby girl is 6 months tomorrow and weights 17lbs 8oz is that a good weight or is she to heavy she is 24 inches long

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    • Sandygabriela

      My baby is 17 pounds 24 inches long 5 months old also I think same thing she eats 5 oz bottles

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  6. Eddy

    My son is 7 months old and his weight is 17lb. His birth weight was 8lb and 13onces. I’m a little concert about his weight because every time we go at the doctors he says your baby is too little . I think my son is less than 10 percentile but he’s very active. He crawls on both sides a lot, he tries too reach and grabs on the things that he wants. He is very happy and moves a lot. The doctor said he needs to drink at least 40 oz of milk a day and my son drink 10 oz of milk and 16 oz of solids that I made them myself. He was breastfed till 6 months and than I started him in formula. I have tried 4 different formulas and finally I’m using one now. He doesn’t really like formula. I don’t know what to do. How to make him gain weight. Maybe he is like me, I’ve always been on petite side when I was young. My first son was born 9lb 12onces and he was always big. He’s like my husband.

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  7. Julian Wilson

    My son is 30 inches long and 26lb 8 ounces at 6 months. He sits on his own and is very aware and is starting to try to play on all fours. How normal is this?

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    • CHELSEA

      My son just turned 6 months and is 30 inches long. He is 28 pounds and was sitting up at 5 months. He just started standing on his own. He wears 2t-3t pull-ups and wearing 18 months clothes.

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    • Heather Amrine

      I’m so glad you posted this. My son is almost 7 months old. He weighs 27 lbs and is 28 in long. He’s completely “normal” on milestones and is a healthy, happy baby!

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  8. Vivian Frimpong

    My Son weighs 13,30g and 73.5 long at his six months is it normal?

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    • Vivian Frimpong

      My Son weighs 13,300g and 73.5 long at his six months is it normal? Should I stop breastfeeding him?

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  9. Amanda

    My exclusively breastfed boy was 5 lbs and 19.5 inches long at birth. He’s now 6 months old and is 28.5 inches long and 21 lbs, 5 oz. The doctor says he obviously very healthy!

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    • Congratulations! Sounds like things are going very well.

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  10. Harry

    My son is 6 months and 4 days. He weighs 31.5lbs and is 29 inches long. He has always been on the big side weighing 10lb at birth. Dr says he is healthy.

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  11. iphie

    I have twin girls who were exclusively breastfed for 6 months. At 5 months 3 weeks, one weighed 10kg (22lbs) while the other weighed 7.5kg. At birth, they weighed 2.2 & 2.3kg. I don’t intend starving my child cos I know she’ll lose the weight when she starts walking.

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  12. Bhoomika

    hi,

    My son – aged 6 months weighs 5.8kgs (almost 13pounds). He was on the healthier side till 3 months, but has fallen ill twice (cough and cold at 3.5 and again at 5.5 months) and during the period drank little milk (Breast fed exclusively till 5months) and not taking well to solids . Hence, he lost some weight and subsequently, weight gain has been low. Till his illness at 3 months he was sleeping well (9-10hours of sleep in the night – with only one feed in the middle and few naps in the daytime. Since his illness – hes been sleeping 8-10 hours in the night and gets up almost every hour or two (except the initial 3 hour) and naps 5-6 times during the day for 15-20 mins. I am concerned abt his slow growth – is it taking a toll on his sleep pattern as well and thereby being a fussy and cranky baby. My pediatrician says i shouldnt be worried and he will catch up later. Any views??

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  13. ursula

    my baby is 6months and she is 6 kg and 65 cm long small baby but active….she is sucking for short time but doctor says she is going on her line so its good …she was born very small so i think its the way she is but i wish to see her put some more weight

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  14. Lsley

    My grand-daughter will be six months in 2 days…she only weighs 12.8 pounds. Should we be worried?

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    • Brandi

      I think it depends more on how much they weighed at birth. My son was 5 pounds 15 ounces at birth and as of yesterday at his 6 month check up he is 13 pounds and 13 ounces.The doctor said he looked perfect though.

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  15. Kate

    My 8 month old grand daughter weighs 27 pounds. I think she is a bit heavy.

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  16. Shivan

    My son is 6 mths n his weight is 22 pounds n I’m not going to starve him or do anything about it bcus wen they reach they walking stage they lose weight really fast

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  17. Jojo ju

    My daughter is 5 months going to be 6 months next week. She’s 18lbs 4oz she is 24inches. She’s sitting up and trying to crawl already, is she overweight? BTW her doctor didn’t say anything to me about her being overweight. Need answers please

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    • Amanda

      Doesn’t sound overweight at all to me. My 6 month old is 21 lbs, 5oz and his doctor said he’s very healthy!

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  18. Felicia Santana

    My six month old daughter weights 10 pounds and 10 ounces and is 23 inches long. She was 7 pounds and 20 1/2 inches long when she was born. She can sit up and roll over like every average baby but she is having trouble gaining weight…really worried.

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    • TT

      Are you feeding your baby cereal and other stage one foods?

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    • alana

      Same problem here. My daughter will be six months old in a week. She only weighs 10.5 lbs. She’s breastfeeding and active. So different from my other kids. I am also worried something might be wrong :(

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    • Brittany

      My baby is almost 6 months old and she’s only 10 1/2 pounds and last I knew she was 23 1/2 inches long. Mine has also had trouble gaining weight. She has reflux. Does yours have reflux?

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  19. Ashley

    My son was 6 months 2 days ago. At his check up he weighed 22 lbs 13 oz and is 25 inches long. He wears 12-18 month clothes.

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  20. brenda

    mM daughter is 6 months old. She weighs 19.3 and she’s 26 1/2 inches long. Her pediatrician said she’s over weight… Ss she over weight by a lot? I need answers please.

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    • Nates Grandma

      My grandson had reflux diagnosed at 5 weeks and was put on medicine (forgot name but very common) 3 times a day plus a Similac formula for “Spitting up”.
      It has taken til 6 month old to go from 17% weight to now 50%. Wishing you well.

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  21. Kiarra

    My daughter is 6 months and she weight 9 pounds and 7oz is that bad?

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  22. Kadian Smith

    My son is three month old and weighs 10 pounds. He is tiny. Is that bad? Need answers…….

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  23. Adam

    My baby is 6 months old , he weights 20.943 pounds. Height 25.196 inches. My doctor aid he needs to loose weight. Is it ideal or overweight??

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    • Ginger

      Your baby doesn’t need to lose weight and don’t ever restrict feedings. My six month old son is 23 lbs, 27 in long and his Dr says he is very healthy. I’ve also been feeding him only breast milk since he’s been born.

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  24. muhammad rafiq

    my daughter age six month and her wight is 15 pounds height 27 inch plz advise natural food for her

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  25. carolinha

    my son was a preemie he weights almost 15lbs and I think its very low he was a 2.10oz baby im worry he hasn’t sit up and he will be 7 months this july 24th I need answers.

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  26. Lucy

    My son is six months and he weights 20.6 am
    Concern about his weight

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  27. Josie Valdez

    I have a question my daughter is 6month and I’m a little worried on her weight. She weights 13. 2oz . My dr. said she need to gain weight and below her weight. She is 25inch long . So my question is she okay. I been starting to feed her solid food like oatmeal and add my breast milk. Help!!!!!!!! :(

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