My two month old hates tummy time. I'm worried it will affect her development as all I keep hearing from everyone is how much she should be doing at this age. She lifts her head up a little but just cries all the way through. If we sit her up, she is able to hold her head in position so I'm not concerned that there is an issue there but I'm worried that not enjoying tummy time will affect her? Has anyone else similar problems?