What is the 4-month sleep regression?
Around 4 months, babies' sleep patterns mature and they begin cycling through lighter and deeper sleep stages like adults. This can cause more frequent night waking. It's a permanent change in sleep architecture, not a phase to 'get through.' Consistent routines and age-appropriate sleep habits help.
This information is general guidance and does not replace professional medical advice. Always consult your pediatrician for medical concerns.