I think he is going through the 4 month sleep regression.. You can try googling '4 month sleep regression' to find out more. My baby went through 4 month sleep regression too. 😔
Hi... you might find this article informative https://sg.theasianparent.com/tips-on-getting-your-baby-to-sleep-longer
Thanks alot, am on it 👌
Confidence Amara Omoruyi