Just when you thought you were able to squeeze in a regular few hours of uninterrupted sleep a night, your baby’s routine goes out the window!
The big change tends to hit at around 4 months, but unfortunately there are more to come...
These periods of disruption are coined “sleep regression”.
Kim West, author of , prefers to use the term sleep progression, because the phenomenon is usually caused by your baby’s developmental progress.), agrees that these fussy periods generally coincide with a baby’s developmental leaps.
