You have a baby. They poop amazing, enormous amounts. When my small friend was much smaller, he used to produce poops that were as big around as his leg, and half his bodylength! And then, fifteen minutes later, without eating anything, do it AGAIN. o.O
Sometime around the 6-month mark, I noticed his pooping had decreased. By 9 months, it's more like 2 per night, each roughly as big as his leg.