I’m at a complete loss. Baby is nine weeks old today and ever since we brought her home we’ve done tummy time and played on her back on the floor. The last four days she is having none of it. We’ve made sure nothings hurting her and do everything we can think of to make it fun and interesting. She screams her head off the entire time and stops the instant I pick her up. I’d really appreciate any advice, I worry so much about her being mentally stimulated.