9 weeks baby no social smile

[MillyS84]

Hi, my 9 weeks baby doesn't show social smile. He smiled at us a few times during weeks 7-8 and then he started being more interested in the environment around than in us. He smiles at the lamp, at the woodpecker of the baby gym and randomly. Otherwise he makes eye contact and he tries to mirror us doing vowels. Should I be worried? Any similar experience?

“What If My Baby Isn’t Smiling Yet?
Don’t panic if your little one isn’t grinning on schedule. Every baby develops at their own pace. Factors like prematurity, personality, or even just being super chilled out can affect when smiles arrive. Keep interacting, talking, and making funny faces—they’re soaking it all in, even if they’re not showing it (yet).”

www.adventurebabies.co.uk/when-do-babies-smile-a-milestone-worth-grinning-about/#:~:text=The%20Science%20of%20Smiling,I%20love%20being%20with%20you.”

Absolutely keep interacting and talking to him and smiling at him. Thats the most important thing.