Baby not eating during the day

My baby barely eats during the day at all anymore he will eat for like 3 minutes every few hours and it’s concerning. He eats a lot at night though he will eat every 2 hours throughout the night and eat for 10-20 minutes. He is peeing a lot and everything and when I try to feed him during the day he just looks up at me and smiles and won’t eat so he’s not upset or anything he’s an extremely happy baby is this normal? He is breastfed by the way