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Also, I know they say put the baby down awake. With my first though, I ended up having to let her fall asleep on the breast then gently move her to bed. I would do a switch and stick the pacifier in her mouth. I'm happy to say it didn't ruin her sleeping pattern now. She's 2years old and after a short song and cuddle she lays down and falls asleep on her own, and sleeps 10hours without waking. And we broke her of the pacifier at 15 months.
With the nursing all night you must be exhausted. With my dd, I would feed her food and then nurse her till she fell asleep. Maybe the milk just isn't enough at night.
Since your husband is being deployed soon. If you can find a few nights where your oldest can stay somewhere else and you have time off. Don't give in...let the youngest cry it out.
If everything medically is fine with him, he does just seem really stubborn. How long are you planning to breastfeed? If this doesn't "fix" itself now, you're going to be feeding bottles or sippy cups in the middle of the night.
I hope maybe something in this helped. I wish you the best of luck resolving this...And that maybe you can get a few extra hours of sleep tonight!!!