The heaviest breastfed baby I ever saw weighed 50 lb (22.7 kg) at a year.  I saw just the baby's arm at first, over her father's shoulder, across a very busy room.  Just seeing the arm, I thought, "There's something wrong with that baby."  It turns out she had been to specialist after specialist, finally ending up with Alan Cuningham, one of the first US peds to note the difference in health between first-world breastfed and formula-fed babies.  "You have a perfectly healthy breastfed baby," her parents were told.  "Take her home and enjoy her."  Later, their second daughter followed the same growth pattern.  Both slimmed down as toddlers.  Strollers are not allowed at LLL conferences, except for multiples... and this baby.  She was just too heavy to carry.  

My guess is that the mother's milk was just unusually high in fat.  The girls ended up looking like everyone else.  Whether there will be longterm health consequences, no on knows.  But they seem to be just fine, and I don't know what might have been done to alter their growth short of something really disruptive to mother and baby.

Diane Wiessinger, MS, IBCLC  Ithaca, NY  USA
www.wiessinger.baka.com

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