Quote:
Originally Posted by Katie T 
I have a question for you wise ladies. My sister has a 14 wk old who ever since her mature milk came in has had brownish green mucusy poos. Every diper change, she is fussy and spitty sometimes projectile  She was born weighing 10 lbs 1 oz and at 3 months was up to 16 lbs so is gaining great. She is going to try and eliminate dairy from her diet and was wondering how long something needs to be out of your diet to see a difference if that is the problem food? Sorry this is all over the place kids are being crazy lol. Thanks for any ideas as to what is causing this and suggestions.
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Ahhh, green poop. Green poop indicates an excessive amount of lactose going through the gut. It does NOT indicate lactose intolerance and this is good news for your sister. Eliminating dairy from her diet will probably have NO effect on the poop situation.
You mention that the baby is gaining weight well -- this also indicates that this is not a lactose intolerance, but rather a foremilk/hindmilk imbalance. Truely lactose intolerant babies are rare and they tend to not gain weight well.
What green poop tells us is that the baby is receiving inbalanced milk, too much foremilk and not quite enough hindmilk. When the baby goes to the breast, the first wave of milk is thinner -- terrific for quenching a baby's thirst. When moms talk about having a strong letdown, this is what they are feeling. A heavy flow of thin, sweet foremilk. After the baby has nursed for a few mintues, the milk flow slows and the breast releases more fat. This fat is the gold of breastmilk. It is richer and satisfying.
When a baby has green poop, it lets us know that the overall composition of the feedings are heavy on foremilk. A baby who is nursing primarily on foremilk will be hungry! They will want more since they are not getting the fattier milk. So, they nurse more and more leading to the projectile spitting that your sister is seeing.
How to fix it?
More time at each breast. We need for the baby to completely empty the breast. This may mean that your sister will only need to nurse on one side per feeding if she has a larger supply of milk. But it is important that the baby empty the breast well.
If she nurses well on the right and the baby is sleepy and satisfied, she can then save the left side for the next feeding. If the left gets too full and uncomfortable, she can release a little either through hand expressing or pumping just a little (1/4 C or less). She should take care to not pump a lot at this point, since she really does not need to increase her supply.
Great article about foremilk/hindmilk imbalance:
http://www.llli.org/FAQ/foremilk.html
Scattered typing. Apologies. Nursing my own wee one to sleep.