My 2.5 month LO eats from one boob for each feeding. For the last week she hasn't nursed for longer than 5 minutes before she pops off. (Most nursing sessions are around 3 minutes..every 2.5-3 hours) I've tried burping, changing positions, switching boobs, offering a bottle of pumped milk....she just isn't hungry. She seems to be happy, sleeps through the night and doesn't look underweight but I still can't stop worrying.

Did your LO go through periods of eating very little?