My LO has consistantly been in the 95% for weight. I have a friend who's LO is teeny tiny, she was 10 lbs at 4 months, and at 6 months still wears newborn clothes. She always says the doctor says her LO is perfect, and my doctor always says my LO is perfect. I'm always worried that he'll say she's too much of a chunk! But she's clear about when she does and doesn't want to eat, and they say that babies don't eat when they're full.