hey sianie, thanks for sending that. His A's do look really low for his age. I think its time to extend.
At just over 6 months, i would think an A of about 2.5-3 hours would be about right. so you'd aim for a nap about 9.30am for 1.5 hours and another nap about 1.30pm. It might be time to drop the catnap too. how do you feel about that? Its gonna take time to get there, so for the next week or so stretch the A to about 9.10 in the morning and see what happens. it might work, it might not!
let me know how you get on over the next week trying to extend the A's by about 10 or 15 minutes (a good tip for doing this is in his room, like nap time, so curtains closed. do a nappy change, read a book, then go round and say goodnight to everything in the room (teddies/lightswitch/nappy pile whatever)) and see how you go.
If you can (i understand you will be busy with 2 babies) try and remember the A's where he sleeps through 2 complete cycles so 1h30nap+ without assistnace from you, and that will give us a clue as to his correct A time.
HTH
Lilixx