Their baby, their choices. It's really that simple. Not everything a young couple does things differently than you is a sign of a problem. Maybe they didn't have the baby to treat it as a shiny new toy to show off. It's just as normal for new parents to want to adjust without someone plastering the baby's face all over social media as it was for you lot to host drones of people postpartum. Thankfully, I had a respectful family that wasn't so self-involved that they made a fuss about us not wanting visitors right away. It's how families who actually care about being a true support system act...supportive. Making someone else's milestone about yourself is anything but supportive. Why on earth would grandparents' excitement be prioritized over what the new parents were comfortable with? They had the baby to become parents, not necessarily to make anyone a grandparent. Never lose focus of that because it will help keep things in perspective. It's not about extended family right now.
"This doesn't come from he new mum". Amazing how assumptions about the inner workings of other people's relationships are considered completely normal when they couple doesn't behave exactly how others expect and want them too. Maybe, just maybe, the couple is on the same page since it's their baby and not the grandparents baby? Adult sons and daughters aren't merely extensions of previous generations. Believe it or not, they are adults with their own minds, wants, and needs. Already, the divide and conquer attitude shows and the baby just got here. I really hope these grans do not start trying to pour this divisive talk into the ears of the new mum. The last thing they need right now is pressure from extended family to break team.