Stool Changes

My daughter is 3 weeks old and nursing. For the last week she’s had diarrhea. Should I be worried?

Stool Changes

Dr. Greene’s Answer:

Babies’ stools go through many changes during the first eight weeks or so. First are the days of slow, sticky, meconium stools, but by the end of the first week, stooling speeds up and breastfed kids have a stool every time they eat–or even more often. They average 8 to 10 soft, yellow, seedy stools.

Over the next three weeks, in breastfed kids, this number usually starts to drop. By 4 weeks, the average is about four soft stools a day, though there is quite a lot of variability in this. At 8 weeks, the number drops to an average of only one a day and some breastfed babies have only one every several days–up to once every seven days or so can be normal.

If your baby is suffering from diarrhea, our biggest concern is dehydration. We want to be sure that kids are getting in plenty of fluid to replace what is lost, and then some. If you were to notice yourself becoming engorged, or if you notice that your baby is not making at least one wet diaper every eight hours or is suffering from a fever, dry mouth, or dry mucous membranes, you want her to be seen right away. It is also important that your baby continues to gain adequate amounts of weight. If she isn’t, your doctor may suggest some tests, supplementing with formula, or pumping to increase your breast milk supply. Otherwise, this type of stooling could come from developmental changes in the intestines or from a mild virus. It could also be a reaction to a food in your diet (the most common of these is to milk). Let your pediatrician know about the stools in a phone call or at your baby’s 1-month checkup.

September 27, 2008

Dr. Alan Greene

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.

  1. Maricela

    Hi Dr.Greene,

    I hope you get a chance to look at this message because I am in deep need of a real consultation. So my son is 14 months old and he was switched to whole milk once he turned one. Since about mid May i started noticing that he had troubles pooping and now its worse.

    My son is usually a quiet super happer baby and lately hes been extremely fussy, lack of sleep, doesnt want to sleep, gets super upset when we say no or take something away-plus right now he is always wanting to be with me. We gave taken him to the doctor twice and havent really done anything about it. We have tried the peune juice, giving pedialite, gripe water, pedia-lax liquid suppositories and nothing seems to work! He cries so much and sweats whenever he. Does poop. I just really dont know because hes lost weight and definetly has hard stool problems throughout the day. He tries pushing, turns red, and just stops. please help mr

    • Hi Maricela,

      It sounds like a tough time for your son – and for you. The things you have tried so far (prune juice, pedia-lax, etc.) are aimed at solving the symptom of constipation. If possible, it’s great to find and address the cause. The one clue in your question is his recent switch to whole milk. In many kids, a reaction to milk can cause constipation ( If the pediatrician is not able to find and address the cause, a pediatric GI doctor can often get to the root of the problem, especially if weight loss is involved.

      • Maricela

        Hi again Dr.Greene,

        So i was able to take my son to his pediatrician and she recommended for me to stay on soymilk and having him drink water with karo syrup for the next two weeks. If it doesn’t work then she recommended for me to switch him to 2% or skim milk.


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