Join Date: Sep 2007
Location: Grand Haven, MI
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This is just a shot in the dark, but is it possible that they're overtired? What you're describing (nursing happily to sleep, then waking up upset when put in the crib/bed, repeat, repeat, repeat) is exactly what my kids do when they're overtired.
Around this age a bedtime routine (bath-book-boob) kind of helped with my oldest but it took a few weeks for it to sink into his head . I don't know how that works with twins.
If they're happy during the day, then it doesn't sound to me like food allergies or your IUD or even low supply, but other mamas here might know better.