Student or Learner
I've heard these two sentence, but I don't know if they are generally acceptable:
You should drink fewer sweet drinks.
It doesn't matter for me whether the new born is a boy or a girl.
#1 is fine.
#2 should be 'It doesn't matter to me whether the baby is a boy or a girl'.
It's possible to use newborn (one word) as a noun, but it's not colloquial in everyday conversation.
Please note that a better title would have been You should drink fewer sweet drinks.
Extract from the Posting Guidelines:
'Thread titles should include all or part of the word/phrase being discussed.'