We recently bought a er spanial she only 8wks she bitting thn gets very aggressive

we jst bot our puppy 2 wks ago most of the time she fine, bt whn she play bites she end up gttin agressive n starts growlin thn really goin for your hand, when you gine her a row she sometimes stops or she still growl n start barking.. im really worried as i have a 2 year old son an she does it 2 him alot , jst dont want her gttin older n still doin it.do u thnk she grow out it??i spoke 2 a vet he said jst try calm her whn she doin it but it hard whn she attacking your hand..