It does not need to have a hyphen! :)
No, the word "nineteen" does not need a hyphen when written numerically.
14 years old
No
Yes you can baby sit at 10. But you need a license. So go to the baby sitter's course, pay 40 bucks and learn. XD And also you MUST be responsible
It's not a word in the dictionary, so yes, use the hyphen.
I do not believe that multitasking is supposed to have a hyphen.
You typically need only capitalize after sentence-ending punctuation, which a hyphen is not.
There are many 3 month old babies that can sit with support. You do need to make sure the baby can hold their head up.
ice ice baby
no
No