"A blonde comes home" joke

Day1:
A blonde comes home from school and says to her mum,"
We lernt how to count up to 5 today mummy, i got up to 10 is it coz im blonde mummy?"
mum replies"
yes dear:
Day 2:
"
We lenrt how to do the alphabet today mummy, the others only got up to E i got up to S is it coz im blonde mummy?"
Mum replies:yes dear
Day 3:
"
We lernt about breast to day mummy, all the other girls are flat chested and im a 36DD is it coz blonde mummy?"
Mum replies:No dear its because your 25.