By Suzana 
Sleep regression happens when a toddler who has been sleeping well suddenly changes the sleeping pattern. The toddler starts waking up at night several times than he or she has been doing, or refuses to sleep entirely and take longer to fall asleep. Mostly, sleep regression occurs at age 3 or 4 months, age 9 or past one and a half years. What causes sleep 4 month sleep regression and how can a mother ease the situation?
At 4 to 6 month old, the toddler has started to notice things and people around her. The baby may get fascinated and in the mood for plays and laughs during the day, taking most of his nap time. The toddler sleeps late hours, since the sleeping schedule was interfered with.
If it is watching cartoons or sitting with adults to play, the same can be scheduled in a manner that it will not interfere with toddlers napping time. Have a bath and massage before sleeping so that the toddler can relax and sleep well.
If the feeding schedule has been altered, sleep regression will also occur. Earlier than usual feeding may make the toddler wake up severally due to hunger. Avoid frequent altering of the feeding timetable, but if the change is inevitable, the baby will adapt with time.
Change of diet can also cause the sleep regression. Remember that the baby is still a toddler, and not used to consuming several types of foods. Actually, most toddlers at age 4 to 6 months are on exclusive breastfeeding or formula milk. A 6 months old sleeping schedule will be interfered with when the formula or breast milk is changed. To curb the problem, change the diet on daytime or early morning, to be able to monitor the toddler.
Change of weather can also cause sleep regression especially to toddlers who are not used to travelling. The weather change makes the toddler not to sleep well at night, and hardly naps during the day. They may also suffer from cold-related symptoms such as flue due to the change of weather, thus affecting their sleeping schedule. Avoid travelling with toddlers of this age, unless where need be. Keep the baby warm and carry with you the right clothing for the current weather.
Form a sleeping routine that will be followed during bedtimes. The sleeping schedule can comprise of an early meal, bath and a story reading moment to make the toddler fall asleep.
In conclusion, there are several ways of dealing with a 4 month sleep regression. Note that not all methods will work for your toddler simply because they worked on a friend’s baby.