They've reduced that. Seriously, being able to take four hits before dying would be way too easy.
Also, if you think Yoshi's Island was easy you clearly did not go for 100%, because finding everything was difficult and some of the bonus levels were also tricky.
I never go for 100%. That just feels like pointless time wasting to me since it usually involves searching through places I've been to already in order to find every single secret.