My daughter never really spit up and my pediatrician said that she'd definitely start spitting up more after 6 months. (she technically did, but still it was very rare).
Just thinking if you just started solids, then your LO might be 6months-ish.
I forget the reason. Digestive system maturation or something.
SAHM to Magnolia May (09/10) and Luke Russett (04/13) and wife and best friend to my airman.