At what age can they lay on a playmat and lift their head? Like "tummy time"

Yes, like @izzypeasylemonsqueezy said I started doing tummy time with my DD around a month old

I try tummy time but he just cries and like suffocates himself cuz he cant lift his head up yet which is kinda odd cuz hes super good at keeping his head up if you hold him/he sits up straight. But guess hes not as good at it if hes laying down

@izzypeasylemonsqueezy I couldn't get down and up off the floor that soon. I had a C-section

Around 3 months he will lift his head he seems to be a normal month old baby. My 7 week old is the same hes just now starting to get more control but isnt there yet and my older 2 did the same all in good time! He's a perfectly normal baby to me

He can start now. The more he does it the better he will get at lifting his head. Try turning his head so he lays on his cheek.

I started exactly at 2 months, and she hold her head already. I was scary to try tummy time earlier)

You can start any time. Don't expect much but he'll still be getting stronger.