Starting solids

Mahak

Hi! I just started very little solids for my 6 month old baby. Just some cereal and today some banana and very little Avacado. She drank significantly less milk today (12 oz) than she usually does. I just wanted to find out if that’s okay or is she under fed ?

She also hasn’t gone to the bathroom since Monday night which isn’t unusual but just wondering what could cause her to eat so much less.