My granddaughter is 4 months old and she loves tummy time on this play mat as she don't like tummy time on the carpet or changing mat. My granddaughter loves lying on her tummy trying to get the fish. It's lovely and the bright colours of the fish inside. They just float about and keeps her entertainment and takes her mind off the time she spends on her tummy. It's easy to use you blow up the outer edge and the inner circle you can blow up or fill with water. We chose to fill it with water. It's a bit heavy but brilliant as it doesn't tip up or over with water. It's like a little water bed. #rankboosterreview #waterplaymat