They'd already started holding up their heads when we put them on their fronts, so we stuck to our 15 minutes of tummy time routine on the road as well. (babybjorn.com)
Just remember to allow for plenty of tummy time when your little one is awake to strengthen his neck muscles. (health-and-parenting.com)
Do you do a lot of tummy time with your babies? (ababyonboard.com)