NalwortTeen Girls Period Underwear Menstrual Period Panties Leak-Proof Cotton Protective Briefs Pack of 6

Do you wear a pad with these?

Can these be worn instead of a pad for younger girls just starting?

Is the fabric thick to give support?

Please help clarify size chart! I see it's sorted by age. What is the best size for a 120lb 5’5 person who is typically in woman small/size 2-3 pants?