There are so many changes for your baby in the first few years; it is the biggest period of development in their whole life!
Just when you think you’re on top of things sleep-wise, something happens and all your hard work goes out the window.
I have a short nap routine and I use a sound machine during her naps. If your 4 month old learns to fall asleep independently through some form of sleep training - the level of crying sleep training needs to involve can be up to your family - then it may solve this problem.
The drive to sleep is much less during the day so it is more difficult for infants who do not fall asleep on their own to make it through a sleep cycle transition.
Though Hailey usually struggled with both, sometimes she would snooze solidly in the morning, then fight the afternoon with all her might.
If we were on a long trip (4 hours), Hailey usually slept for a bit at her normal nap time; otherwise she stayed awake just fine.
Our recommendation would be a shorter nap in the morning and the late afternoon and a longer nap around midday (of over 45 minutes).
If this isn't happening for you we can certainly help!
Although she tends to follow this pattern, she is by no means predictable and her patterns still vary from day to day. The morning nap can also be where you start establishing that sleep can happen without a bottle, which is always a good thing, if you can manage it.
I’m still pretty much going off of her cues for eating and sleeping at this point, except I wake her up during the day if it’s been 4 hours since she ate last so she eats enough during the day and possibly stays awake enough to realize the difference between day and night. (If milk is crucial to the sleep routine, however, an extra couple ounces here isn’t the end of the world.) Now, the afternoon nap can be tricky.
As your baby grows into a toddler and their need for sleep decreases, it is still extremely important to provide an opportunity for naps and rest time through to about 3-4 years of age.
Most toddlers are ready to transition to just one nap somewhere between 14 and 18 months of age.
My daughter is 4 1/2 months old and she only naps for 30-45 minutes at a time. She is only awake 1.5 hours before she begins showing sleep signs.