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Given a travel related situation, and given a specific question about the situation, summarize the question into a title

The green carriage is of course first class. This would be our first preference with our 5 month old baby in lap, because of the presumably larger toilets for changing and whatnot. However, the baby being a Western white baby... will occasionally babble, screech or cry uncontrollably for a little while.

Speaking in terms of Japanese culture, should we avoid Green class tickets if we are taking aboard a potentially disruptive baby?

Solution: Japanese train etiquette: Is it acceptable to take a baby in the Shinkansen Green Car?
Why? A person gives a detailed description about a situation where they would prefer to travel on the Shinkansen Green Car but is doubtful if doing that would be against the Japanese train etiquette since they will be traveling with a baby. The question is summarized as Japanese train etiquette: Is it acceptable to take a baby in the Shinkansen Green Car? for easy indexing the next time someone searches for a similar phrase

New input: Background:

I was originally booked on WestJet from Boston to Glasgow through Halifax. This week, they informed me the BOS -> YHZ flight is canceled, and are wanting to route me BOS -> YYZ -> YHZ -> GLA, doubling the length of the itinerary.

I've called WestJet and they say they can't come up with anything better, so I'm looking for other alternatives.

One possibility is to book a flight on a separate airline from BOS -> YHZ, then take the original YHZ -> GLA flight (after telling WestJet that's what I'm doing, to avoid being seen as a no-show when I don't get on the plane in BOS; the agent I talked to said this would be possible).

The concern is that I will be traveling with checked bags, and these would be two separate tickets, so I'm assuming I will need to clear customs in YHZ, collect my bags, and then re-check them and go through security again, and I don't know how long that will take. Assuming nothing changes (and my faith in that is...tentative, at best), I will have 1 hour 50 minutes between the flights.

Questions:

Are my assumptions correct? I will need to collect bags, clear customs, re-check the bags, clear security?
How long does that process normally take? The flight from Boston is a small plane, arriving at 9 PM on a Sunday.
How long might that process take in the worst case scenario? (I mean, I suppose the worst case is it takes days because something goes horribly wrong, so I guess I'm really looking for an idea of what's a reasonable upper limit...)
It might be possible to get NEXUS before the trip. How much will that affect things?

Solution:
Customs for connections through Halifax with checked bags and separate tickets