4 1/2 month old will not sleep through the night?

At around 4 months your baby is going threw a growth spurt. They call it the 4 month sleep regression/growth spurt. Until just recently your infant was able to just fall asleep and instantly be in the deepest possible sleep, around this time, babies sleep patterns change. They actually have a sleep pattern, much like an adult only it doesn't take as long only about 45-50 minutes to get threw a full cycle of sleep. That's why your little one is up more often and won't sleep as well as before. You can try different techniques to teach your infant to self soothe and go back to sleep once she wakes up a little, or just wait it out. It is a phase and it will p. Good Luck mamma!