Nap troubles


What do you guys do when your baby won't take that last nap of the day? I tried putting him to sleep at 3 pm, that failed, tried a little later at 4 pm and failed, then tried rocking to sleep and failed.

Now he's been up since 1 pm.

His bed time is between 6.30 and 7 pm depending on the day, but I don't know if i should let him sleep even earlier today. So confused!