Which town to stay in Malaysia with a toddler?


we're looking for a town to stay in Malaysia, winter 2019 for 2 - 3 months, with a toddler.
It would be good if we have some sort of beach, not too big of a town/city but a decent hospital around (just in case) would be good.

Any recommendations?

Penang wouldn't be my favourite, due to lack of beaches and maybe too crowded.
I think I've been to Kuala Selangor years ago, but don't remember clearly whether it would fit the current preferences.

Thanks in advance :)

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