I would ask your son, and just explain you want to do this on their terms, he’s still very young as yet, and they still be finding their feet, I’d give them a bit of space but go through your son, I’d send some flowers and ask your son is there anything they need you to do to help, etc food that he could pick up,( if live near) apart from that, I’d play it by ear, I didn’t have a traumatic birth with either of mine, and I found it hard in the first few months, but for me I had a MIL that was at my house every single day which was extremely hard, telling me how and what I should be doing, not saying you are like that as you seem a lovely grandma sranney, I’m sure it will be fine, wishing you all the best x