We started tummy time from the time she was born . It helps them with gas , and with them strengthening their head muscles. My daughter has always loved tummy time . We've always laid her on her mat but now she's actually interested in the toys, she's almost 4 months.
My daughter just turned 2 months and shes paying more attention to the dangling toys now. Per her pediatrician we started tummy time about 1 month..little after
My sons dr recommended it at a young age but he hated it until now (almost 4 months old) he loves playing on his playmat and he enjoys tummy time but only for 10 minutes then he gets fussy