Start from day one. And, it is recommended you do a minimum of 45 minutes a day total (not all at one time, obviously). I work as an Infant Development Specialist in a hospital, so getting the word out on the importance of tummy time is my passion We start the babies in the NICU around 36 or 37 wks gestation.
Re: Tummy Time
My ped said to start it by 2 weeks. We did at 1 week.
Had flat spot issues with #1 and desperately want to avoid it this go round.
We pretty much started right away. Only a couple minutes at a time, but gradually increased it.
We had no flat spot issues, and she never fussed about being on her tummy b/c I think she just got used to it early.
Ryan 5/2010, Kyle 1/2007, Eric 3/2005