Ok, so to set the scene, my baby came 4 weeks premature at 36 weeks.
No one knows whether this will impact his development, or to what extent.
He is doing some things right (lifting his head, he sometimes crawls up my chest , albeit when he is very hungry, but can definitely do a good climb up a go!).
His hearing test in hospital looked fine, but he does not seem to be reacting to my voice or that of my partner, no cute cooing sounds or smiling when seeing us which apparently is meant to be happening now-ish. He has cracked a few smiles, or at least that's what we hope he did, but not something that occurs often. When should we be getting worried, or start looking if all is well|?