This is a good place to start.
I'm so sorry you are feeling stressed out even more.
Certainly not my intention.
I would definitely not be one to go to dramatic accusations but I find this really strange.
11 weeks is just so small that most people would be genuinely hesitant at the responsibility, but these people are harassing you.
I never co slept with my 4 babies because I would have been a bit nervous of rolling on them or a blanket covering them, so the idea of someone wanting to do it with their grandchild is just very strange.
Such a huge responsibility to be pushing for.
I think their causing you stress by haranguing you to do this, is also very strange.
I am very sceptical of anyone that refuses to hear the word No.
It speaks to me as very disordered thinking.
They want what THEY want, won't accept that this is not what YOU want, and simply won't let it go.
Your husband has gotten angry several times because of this.
Definitely not normal healthy people who seem able to accept that you have no wish to be parted with your baby.
I think speaking to your GP and asking for support would be good.
Anyone stressing a new mother/parents, is to be avoided.
At the very least I would not be encouraging visits and would be making them very short.
If they visit, make plans so that it can't be for long.
Give your husband the final opportunity, before they next visit, to say that there is to be NO further mention of overnights.
If they still do not respect this, you really have the reason to choose very little further contact.
On the basis of what you have written I certainly wouldn't be leaving any child with them.
My children never went for overnights as it wasn't something that they, or we wanted, so it really isn't an automatic thing that every family does.
I was a very relaxed, confident, first time mother in my 30's many years ago, and what you have written would have stressed me out no end, so this really isn't just you.
These people should be supportive of you and your husband, but instead they are harassing you "for a go off your baby"......like it is a toy bike they want a spin on.
This is really not normal.
Their feelings of entitlement to remove a baby from its mother for THEIR entertainment is NOT normal.
So do whatever you have to, to set down very firm boundaries with these people, who care so little for what is best for your baby and you.
Do NOT allow their harassing of you, to spoil this very special time that flies by so fast.
Wishing you the very best.