this is a normal milestone at this age. do not force baby to remove hands as she will try to do more, just offer colourful pieces of cloth or small toys...

Hai There... Sucking/ licking/ biting is natural process. All babies will do this. No need to worry. Just remove hands gently whenever you see this. this is how baby is exploring their body. Further also...baby will keep things ( whatever they get) in mouth. That's the way the feel that thing and know about it. Best is to divert baby mind...by giving rattles, teethers, rubber/plastic/ silicon toys( kids friendly and soft edged) and best investment will be on Playgym.