Smileless2012
I would suggest letting the GM see the baby just once, after being home for a few days perhaps through a window and maybe apologising for the message, that with hindsight although no upset was intended, they can see that a conversation would have been better.
If the reason for not having the conversation was concern about the reaction they would get, that could be explained too.
The compromise there isn’t on behalf of the grandparents though is it? They’ve achieved exactly what they wanted, got a peek of the baby and an apology from the AC, when the new parents want space. That isn’t compromise on both sides. That’s compromise on one side, from the AC. That hardly seems fair, when the AC have been so very clear about what they hope to happen.