I don't understand what you mean by 'proposal'?
I wanted advice as to whether this is good for the children. I would rather he came to stay at weekends or took them for days out than overnight stays as I am uncomfortable about the impact on them when they are so young. At this point, I am asking whether there is any guidance on shared custody for such young children.
At the weekends he will look after them whilst I get some sleep in the morning but otherwise, he has never had them on his own. He will help out when not working with nappy changes and feeds but generally 'doesn't like routine' (his words) so tends to leave that to me.