Lactose intolerant?

Sarah • Mommy to Emmie Lou 💜. Nora Rose 💗. Army wife. Working Mama.

How can I tell if my baby is lactose intolerant or if it’s something in my diet that’s not agreeing with her? For the past week-week and a half she’s had diarrhea, gas, spits up a lot, seems to have a hard time getting comfortable after eating, kicks her legs and cries a lot, doesn’t like to be on her tummy. She will be 4 weeks old next week but was also born 4.5 weeks early.