Bedtime

Baby girl is 7 months and we have been doing so good with putting her down in her crib at 7 for bedtime and she would go to sleep by herself with no problem. Now from one day to the next it has been completely different. She now just starts crying and crying. We tried to do the cry it out method but after 20 min she actually threw up a bit and that comes even when we would go in and try to calm her down. After that we just put her in swing until she fell asleep and then moved her to crib.

Not sure what to do at this point.