He won’t finish his bottle in 1 session

I’m a FTM and my baby boy Adam is now 3 months and 21 days.

He’s formula fed (please don’t mommy shame, my supply was non existent after 2 months)

Lately he won’t finish his bottle in one session. I thought it was because I needed to change the teats and I did but he still won’t finish his bottles.

I feed him every 3.5-4 hrs and he gets a proper full night sleep but even after 7-8 hrs of sleep he still doesn’t finish up his bottle.

His average feed used to be 4 oz to 5 oz. Now he only takes about 3.5 oz per

session. He’s not losing weight and he has proper wet diapers and all.

Any thoughts from the beautiful glow baby mommies? I’m kinda worried and not worried at the same time 😅

Here’s a picture of my bundle of joy Adam 🥰