okay so instead of assuming your MIL is doing this to keep baby to herself and away from you, i will give you another perspective.
when we as moms spend our maximum time with the baby, we too feel that it is only us who knows the baby's needs best. also, even when our babies are happy and playing, we feel it is time for them to feed and rest and sleep and so on. since your MIL cares for your baby the entire day, it is possible that by the end of it when you reach home, she feels even if baby is playful, it is time for baby to rest. i won't say that she should keep doing this and take away time from you, but maybe she is genuinely caring? please talk to her nicely and tell her what you want and how you too will put baby to rest once you play a little :)
Read more