My baby was also born at 37 weeks and I was wondering this too! I’ve had a few smiles but they’re very rare and not consistent. She’s 8 weeks also x
My baby was born at 38 and didn’t start smiling all the time till 9/10 weeks and cooing started around 11 weeks. “Wonder weeks” app talks about the developmental leaps they have and they go by the due date. I’ve found it matches up with what my girl is doing x
Mine were born at 33+5, and I’ve been told that their physical milestones (head control, sitting etc) will be the same as a term baby. But social milestones (smiling, cooing etc) you can go by the date they were born, as that’s more about the time they have had to practise, being outside the womb x