4 months old drinking lesser than before

Same i had to same issue too with my bb from 3.5 months. Sometimes he only drank 500 the entire day. He was doing this for almost 2 weeks.. Was getting very worried still thought maybe he dont like the milk but then he suddenly pick back up and now drink about 650-700 per day. I can only guess that it’s a phase.

yes same here. i heard that it's normal. babies can see further and are more distracted w the surroundings, sometimes causing them to drink less. my baby gets so mesmerized w his fingers sometimes, that it gets in the way of drinking milk