Hi again,
Now that I have some more time, I will note some things that I believe may be contributing to the night wakings... hopefully we can get to the bottom of it!
Routine wise, at 7 months, we were doing 2x1.5 hr naps with 3hrs A time however a lot of babies start to show a preference towards one shorter, one longer nap, therefore if he does that, that may be all he needs. I would increase his first A though.... that way his A is 3 hrs across the day and even if he's had a short sleep in the morning, he isn't awake too long before the next sleep period. I can't remember exactly how old dd3 was but I think it was just after 7 months that we started shortening her morning nap to 1hr to help her sleep longer in the afternoon as I found the afternoon nap was much better for her, better for her mood, better for her to have a better night and it also fit in with our school runs.
With regards to feeds, I would actually cut out lunch and dinner solids and only offer breakfast. It would be interesting to know what he's eating too as some foods cause discomfort and that may be another reason for his night wakings! Do you feel like he's uncomfortable at night? We didn't do any baby cereal as I found that caused constipation in my LO and more night wakings!
To take the guessing out of when you've fed him last... can you try and follow the EAS pattern and feed him right after he wakes up (with solids 1hr later), right after 1st nap (offer both sides); right after 2nd nap, a cluster feed before bath and then final feed right before bedtime... so it looks something like this:
7am - wake and feed
8am - some solids
10-11.30 - morning nap
feed both sides
2.30-4 - afternoon nap
feed both sides
5.30pm - feed
bath and bedtime routine
7ish - final feed and bed
I understand it must be tricky to follow a routine with another child around... I've attached a link for you to look through, which may give you some ideas on how to entertain your toddler when feeding the baby. Although it does say a newborn, hopefully you can pick some things out that will help you....
'How do I breastfeed a newborn with a toddler running around?' What I would do is pick a time when you will feed him at night and for all the other night wakings, resettle him. At this age, we still had up to 2 night feeds... one around 11-12 and then another one towards the morning (approx 4-5am, sometimes as early as 3am).
I know you said you don't think the paci is a prop but to be honest, if you're having to replug it.. maybe it IS a prop and you might have to think about either weaning it/sleep training without the paci or teaching him to replug? Not sure at what age they start to do that... we got rid of the paci at 4 months with dd2 because she was up all night wanting it and the boob. You mentioned there isn't one particular thing you do and so you're not sure which one is the prop... I think sometimes its us responding too early that can mess things up as well and so I would encourage you to stay back and listen to his cries and if he's just mantra crying, don't intervene at all and only if it turns into a real "I need you" cry, I would go to him and you could try shushing and maybe gently patting his bottom to resettle him or pu/pd. With us, shh/pat was more effective as pu/pd would only make things worse and I would shhh until she was settling down and then leave. Wait outside to see what she would do and if she'd start crying (not mantra cry), go back, shhh/pat until she was settling down and leave. Repeat, repeat, repeat. It's not the easiest thing to do in the middle of the night and I actually found she would settle much sooner when DH would resettle her than when I would go to her.... so I would encourage you to get him to help you out if possible.
Is he working on anything new like rolling? or could he be teething?