Baby one week old: when to start tummy time?
Start tummy time after the umbilical cord has fallen off and healed.
As long as your baby is comfortable, though, you can safely let her play on her stomach right away.
On her tummy, your baby lifts her head, which strengthens her neck and upper back muscles. Being able to move her head reduces your baby’s risk of SIDS because she can move away from anything smothering her. Strong muscles let your baby roll over, sit and crawl.