You can use a play mat from day one, but babies between 3 to 6 months old love it the most.
3 months: During this stage, your baby is developing hand-eye coordination, so grasping for the hanging toys is good practice. Tummy time can begin at 3 months of age.
4 months: Baby will likely begin rolling over. Play mats are most suitable for tummy time, and the hanging toys encourage them to roll over on their own.
6 months: Baby will likely begin learning to sit. baby books The hanging toys will encourage your baby to reach and eventually sit up.
9 months+: Play mat will become a early leaning toy. Babies can learn colors, animals, seasons and other knowledge.