I have noticed many of the babies in my practice start to have problems
gaining weight at four months.  I think it may have to do with 2
factors:

1.  Many mothers start to go back to work after 3 months.
2.  The mothers become lax after a few months taking care of themselves.
    They start running around too much, don't rest as much as they
    should, don't spend as much nursing time with the baby...

Of course, the clinic nurses love to tell the moms that they have no
more milk so start the formula!  I advise the women to spend more time
with the baby, rest, make sure they aren't going overboard with the
dieting and take fenugreek.  Within a week or two, the milk supply
"magically" comes back.

Susan Nachman-Srebrnik, IBCLC
Ranana, Israel