is it normal for a 3 month old to not eat very much one day?

Kayla • Mommy to two beautiful little girls

My daughter ate probably 6 or 7 ounces all day Saturday and it was only like a ounce at a time like ate maybe every 3 hours but would shit up half of what she ate each time. She had no temperature and she was her happy self. Sunday she ate normal and Monday to. Is it normal for babies to just not want to eat sometimes