It's not exactly normal for a three year old to have breast development and discharge, but it can happen. This may be precocious puberty, you should have the child checked out by a doctor.
Visit the doctor. You may have a breast infection.
yes
There isn't actually a 'normal breast size' because everyone is different.
yes it is normal to have stretch marks on your breast that just means you are growing.
The "Normal" range is from almost nothing to huge.
a 12 year old may have discharge because it means that in a mont or in a few weeks she is going to get her period. This happens because a womens body is cleaning itself out so when you get your period, there will be no infection.
there is no normal size of breast for any age it all depends on your genes you could have huge breast at the age of 14 or small breast. i am 15 and i have a 13 year old sister and her breast are bigger than mine it all depends on your genes.
There is no such thing as a "normal" breast size. Everybody is different and everybody develops at different rates. Be happy with who you are, whether you think your size is small or large - you are unique and beautiful the way you are.
yes its normal
Its quite possible for that to happen, due to any number of factors.
it is normal everyones body matures at its own pace some girls develop faster then others.
Absolutely not! She should see a pediatrician now