Not eating as much

Sh

My LO is almost 4.5 months and he’s not eating his entire bottles anymore. He’s up to 5.5 ounces and the past few days only eating about 3 ounces each bottle. I only feed him when he’s hungry now, I never try to stay on schedule if it doesn’t work for him.

If he was sleeping more I would think it was a growth spurt but that’s not the case.

Anyone else dealing with this?