OK I'm back. I know how overwhelming this can feel - but you can get through it
How have the last few days been?
Try not to stress too much about the feeding to sleep, sometimes it gets to a point where the fact that they need sleep is more important than how it happens - but equally if it's your go-to every time it is likely to cause issues at some point. With my kids even now at nearly 6yo DD occasionally gets so hyper crazy at bedtime she can't settle - in which case I break our usual rules and let her have a CD on for a while which helps her relax and settle off. But if we did that every day I know she would miss out on sleep overall and so it isn't allowed on a regular day. When DS was younger he'd find it hard to sleep after nursery, so I'd sit with him - but again on normal days I wouldn't. So feeding to sleep when they are beside themselves exhausted once in a while is unlikely to cause a problem. But if it's the end result of failed PUPD every time then each time will be harder because he will hold out for the feed. Does that sort of make sense?
I think if it was me I would try to clear the diary for a few days, and concentrate on him sleeping in the crib - and avoiding situations where he might fall asleep elsewhere. I would as you suggested go straight for 3h A time now, and use PUPD. Do your winddown, put him in the crib awake (not drowsy, calm is ok) and step back. Leave him unless he cries for you - in which case use PUPD. From the FAQs:
6-8 MONTHS OLD - Pu/pd becomes more of a partnership at this age and it is key that you follow your baby’s pace and make the following adaptations to the basic procedure;
• You don’t pick them up as a matter of course but you offer them pick up. You hold your hands to your baby and say “let me pick you up” and you pick them up when they reach to you.
• You pick them up in a cradle position and say “It’s okay, we’re just going to sleep.”. Don’t rock or sway and don’t make eye contact.
• Put them down immediately after you say your key phrase.
• Once your baby starts to soothe you continue to soothe with words and a hand for presence if this helps your baby. Some babies may find this too disruptive so you take your baby’s lead.
Tracy's advice when establishing a routine was to stick quite rigidly to a schedule to begin with, though I think sticking to the 3h A time would be fine instead of clock times. Her suggestion was to try for 45 mins, take a break if not settled, then go back and try again for the remainder of 'naptime'. E.g. if WU is 7am, first nap is ideally 10am ( I wouldn't actually put him down in the crib much before 10am or again you risk UT fighting), and nap should ideally be 1.5-2h. So you'd try from 10-10.45, take 10 mins break, then try again until 'naptime' is meant to be over at 11.30am. He'll be cross if he doesn't settle, and yes he'll be hungry, but if he has milk and breakfast in the first A time then he won't starve to death! Feed him when you 'officially' get him up from his nap and do whatever it takes to keep him awake.
Tracy advised then pushing on through until next planned naptime ie from an 11.30am 'WU' to 2.30pm. This is pretty tough I think....but you'd be unlikely to meet a lot of resistance at that point! Skipped naps are very common when sleep training but eventually the OT catches up and starts working in your favour. I do think it would be fine to go for an earlier nap though and if it were me I'd probably do milk, lunch and then try again for a nap as (despite appearances) he most certainly will be tired!
Does that help?