Should my baby be able to roll over?

Kayley • 24 years old, I have a little boy who’s 4 and I’m TTC my second baby!! 👶🏻
My son is 3 months old and he hates tummy time, he literally lasts minutes then he screams his head off. I'm worried he'll never learn to roll as he doesn't last long on his stomach. Should my son be able to roll from tummy to back yet? 

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