How young is too young for children?

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im 17 and i just moved to texas and i noticed something at my school, girls bringing babies to class,and not little siblings,their own children.at first i was slightly shocked to see 14 year olds with children but it is just so common that i have gotten used to it, you hear girls saying it all the time "i think im pregnant" i dont know what it is here, are people just not being safe, or are more and more kids wanting to get a family so soon. what do you think is too young for babies?