Okay, I will keep my eye on it and see if we need to push it back out once he's gotten some good rest. It worked again today - 1 hour 20 minutes for both morning and afternoon nap! Huge improvement for my little man.
Can I ask you one more thing? He is waking so early in the morning, and if he were rested, I would say no worries, but he's typically not (he will sometimes go back to sleep if I change his nappy and give him a quick feed, but other times he will just stay awake for ages, not crying)... it's hard to make it through the day on two naps when he wakes at 5am! Do you think these better naps will help with a later wake up or could it be a different issue altogether? He's eating loads, so I don't think he could be THAT hungry. Any thoughts or ideas for me?