Babies no.
That kind of fabric is not nice for a baby,their skin is very delicate, and also needs to breath.
For toddlers, only cotton type jeans, not the real denim.It gets way too hot when they are playing, plus it has little movement.
Not a big believer in fashion trends for babies,they need to be taken into account.
They are not toys to be dressed up, to look cute or cool.