4. Babies drink a lot of milk as it's very _______ for them and helps them to grow up strong and healthy.

Babies drink a lot of milk as it's very **nourishing** for them and helps them to grow up strong and healthy. **Объяснение:** Слово 'nourishing' означает 'питательный', что хорошо подходит в данном контексте, так как молоко питательно для младенцев.