Any female who has started having periods can become "fertile". Any female who has sex risks getting pregnant, especially when fertile. For a girl to be pregnant at 10 years old, she would have had to start menstruating at 9 years old. This is not unheard-of but probably unlikely. She also would have had to be having sex at 9 years old to become pregnant. Again, it could be the case but I'm feeling doubtful. Pregnancy would also depend on the fertility of the male and if the male was also 9-10 years old, I wouldn't be buying diapers anytime soon.
If a 10 year old claimed or was suspected of being pregnant, I'd want to see the doctor's report concerning his physical exam (not a home urine test, since any one could urinate on the stick).
It is possible but bad for everyone including the parents and the baby.
It's not a good idea, but in some cases it'd be possible.
The average height for a one-year-old baby girl is around 29 inches.
The average height of a 2-year-old baby girl is around 33 inches.
The average height for a 2-year-old baby girl is around 32 to 34 inches.
No. It's not possible for a 4 year old girl to be pregnant since her body is not developing yet, and it's impossible to hold the baby when you're that small.
No
It is possible if that 9 year old boy/girl is good at something that people would enjoy.
It is almost always impossible. If a three year old has a genetic disorder that causes it to mature and hit puberty as a toddler (extremely rare) and the three year old is raped, then I guess it is possible for a three year old to have a baby. Although the three year old (if it was a girl) would probably abort or die during pregnancy, when the baby inside of it started to become baby-sized.
YES!
NO, that is not possible.
The question is a little vague, but in general it's at least theoretically possible that a 12-year-old girl could have a baby, or that a 12-year-old boy could father one. The youngest person on record ever to give birth was Lina Medina, who was 5 years 7 months old at the time.