How Much Should a 6-Month Old Weigh?

How Much Should a 6-Month Old Weigh?
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.


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.

Reviewed by: Jori Bogetz, Khanh-Van Le-Bucklin
Last reviewed: September 11, 2010
Dr. Alan Greene

Article written by

Dr. Greene is the founder of (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.



  • 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!!!!!!!! :(

  • Lucy

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

  • 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.

  • muhammad rafiq

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