9 & 10 year old daughters privates aching??

Chelsea

They are growing quickly (the 10 year old has dark pubic hair) and both have the beginnings of boobs 🤦🏼‍♀️🤦🏼‍♀️ they have both said recently their private parts ache. I asked them if it was when they used the bathroom, they both said no. I asked them if it was cramps, same answer. Could it be growing pains? Is this normal??