My 4-month-old baby has started eating cereals and since then, he wakes up several times during the night with gas and hiccups.

Yes, there are homeopathic medicines and probiotics that can help with your baby's digestion issues. Homeopathic products like Cocyntal and probiotics such as BioGaia or Jamieson's probiotic drops can be tried to alleviate gas and discomfort. It is also recommended to gradually introduce cereals into your baby's diet and consider options like barley or oats, which are easier to digest. Furthermore, it is best to wait until your baby is around 6 months old before introducing wheat, as it can be harder to digest, and rice may cause constipation.