It’s possible — after all, laughter can also be contagious, for babies and adults. Or it could just be that one baby is annoyed that his sibling is keeping him up or disturbing his peace.
It can help to put together a support team of friends and family to deal with crying babies and the like, especially when you’re feeling sleep deprived and stressed out. You may also want to establish a distress code to signal your partner or another caregiver when you’re at your breaking point and need to step away from all the crying.
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