Try giving some other formula milk. Uou can give Aptamil formula milk stage 1 till 6 months. It is the closest to breast milk and also contains prebiotics and HMO.

The issue is with the formula then. It isn't suiting the baby. My nephew also had similar issue and my doctor suggested Aptamil Gold. It contains HMOs and prebiotics and is similar to breast milk

Are you giving the right stage formula milk for your baby that will help In easy digestion and there will be no issues of constipation and give Aptamil gold formula milk stage 1 which contains HMO and prebiotics in it which improves babies immunity and gut health issues this is easy digestable and no issues of constipation

Please change the formula milk. That is what is causing the major problem. Give him prebiotics and HMo rich food. That really helps.

Give him Dexolac with FOS. It has fiber which makes it good for digestion and it helps in constipation too.