* He doesn't like baths.

How do you pronounce 'baths'?
Do we have to omit the th sound in normal speech?

Most careful speakers pronounce the th in "baths," although it is common to omit this sound.

I haven't heard anyone not include the "th" in this word ... except for little children who still don't always have their sounds straightened out! Some young children say "baffs," but careful speakers don't, as Ms. Sue has said.

The word "baths" is pronounced with the th sound, like in the word "thin." In normal speech, it is common for some speakers to omit the th sound and replace it with an s sound. This is called a "th-fronting" or "th-simplification" and is a feature of certain dialects, particularly in some regions of North America and England. However, it's important to note that this pronunciation variation is not universal and may not be considered standard in all contexts. In many accents and formal speech, the th sound is retained in words like "baths." So, whether or not you omit the th sound in normal speech would depend on your accent and the specific linguistic context in which you are speaking.