We have been trying to make My DD a little more independent like showing her how to make her own cereal, packing her school bag, dressing herself so that when baby comes in May she is a little more self sufficient and I think the change has come from this.. She thinks because she is doing "big girl" stuff that she can talk and act like a big girl.. Which is definitely not going to fly!!
I also think that the cartoons/Telly shows they watch are influencing their behaviors! I have found that she has progressed from baby cartoons to the older kids cartoons and every second show has some girl or groups of girls all with attitude! Might have to put a ban on!!
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