Ok, so will 6am turn into 7am? Or is it the other way around (sorry I always get confused
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I would just wake him up 20-30mins earlier & do nap 20-300mins earlier and he should wake 20-30mins from nap so you can do bedtime 20-30mins earlier. You can do this for a few days and then wake him up again 30mins earlier, nap earlier & bedtime earlier until he slowly adjusts. It usually takes about 3-4 days for most and most adjust pretty easily. Just move meals and everything else you do with the earlier wake up.
If 6am will become 5am then you try to hold him for his nap and put him down about 20-30mins later, bedtime later & he should start waking up a little bit later in a couple of days and then again try to push 20-30mins later so within a week he's waking up later. Again, adjust mealtimes and everything else.
hth a little
Layla