There are a few strategies you can use to keep your little one awake if you need to stretch their wake window:
Distract your baby with a change of scenery - a walk outside and some fresh air will usually do the trick, even simply moving into a different room could be enough to entertain your little one and stretch their wake window a little bit longer
Stimulate them with activities - take out a play mat and some toys, sing a song, or read them a book
Set the scene - keep the environment bright and active during your child’s wake window, and shut out light and noise when it’s naptime or bedtime