Clingy baby?

Li

My daughter turned 6mo last week. During the holidays she became super clingy at home. Any time I would set her down she would instantly freak out even if she could see me. She woke up 4-6x a night and it would take 30min or more to get her back to sleep because as soon as I would lay her back in her crib she would wake up and scream. I tried to let her cry it out some which worked after a few tries. She is still super clingy during the day and generally more fussy. Anyone else have a clinger all the sudden?