Early Tantrums

Celeste's been throwing tantrums since last week, we are not sure of the reason. Has she been spoilt by us, is it because she is teething, or is it due to change of the nanny to my Mother as care giver? She throws the temper each time she doesnt get what she wants. Its really getting on our nerves! Hopefully, this is just a passing phrase and she doesnt turn out too spoilt in future....