Yes.
yes
Discharge.
Depends on what the "discharge" is. If you're talking about semen, there shouldn't be a problem unless the 12-year-old has an open sore in their mouth.
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.
yes...it is just old blood
No, yellow and/or green discharge is never normal during pregnancy
Brown Discharge is one of common concerns of girls and women. Not all cases of brown vaginal discharge are cause for concern. Brown vaginal discharge is most often associated with old endometrial tissues. Discover more in recommended related link below.
Coefficient of discharge of an ideal liquid can be defined as a ratio of actual discharge and theoretical discharge. where, Cofficient of discharge = Actual Discharge/ Theoretical discharge.
smelly brown discharge is gonnorhea, you need medical assessement and medication. Brown discharge that is not smelly can be old blood, if you eat a large amount of soy, soy milk, tofu, you can have a light period. The body just gets confused.
Yes, this is normal. Your vagina is still "cleaning" itself out. The brown discharge is just old blood. Gross, I know, but it's totally normal. If you have brown discharge for more than a couple of days, I would see a doctor about that. Abnormal discharge can be a sign of an infection or STD.
It depends what your discharge looks like. Women discharge constantly (may have lesser discharge during peri menopause or menopause.) If your discharge is extremely yellow, is foul smelling, dark (reddish color) you should always see your GP and be checked out to be sure you do not have an infection. Discharge for healthy women should be clear to a cream color. After a period, a woman can discharge a brown discharge and this is "old blood" and can pocket inside and it will just release on it owns. Also, there are times just before periods (just starting into menopause) where there is a pinkish hue to discharge and this too is nothing to worry about. If in doubt please seek out your doctor's advice.