I'm not sure what help I will be as my son is (thank god) a heavy sleeper. But we did bed share as a family from day one so it might work out to be about the same.
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My son was 25Months when my daughter was born.
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It woke him up for about the first month...or at least, it was the first month where it was noticeable. I'm sure after that he would just roll over and sleep through it.
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um, well, the first couple of nights we just said stuff like, "yeah, babies are pretty loud, huh?" and explained what the baby needed and wanted. Since he was pretty excited about the experience and what this whole baby business was about he would sit on the bed and look on commentating like a sports announcer. We made sure he had a sippy cup of water and could watch if he wanted.
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Then he became annoyed with it and said stuff like "baby loud...das annoying, mama. You need do baby stop." Then we would make sure someone would cuddle him giving him the right and extra time the next day and plenty of time to make up the sleep.
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the clear and obvious difference is the year you have on me. That year may work to your benefit.
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if your newborn is in your room, you may avoid incident...but then there are the nights that defy the norm. Either way, as with all births, I think the 4th trimester is the hardest on the house and then a new rhythm will be established that will work for all. My only real advice is make sure you are getting plenty of sleep for the first 6 months since that will give you the clear head you need to deal with it all in a reasonable and loving manner.