Question: is 5 foot 3 tall for a 12 year old boy?
Answer: Males stop growing at around age 18 and will accelerate in growth between 14 and 16 and will average around 5′9″-5′11″ by the time they reach 18. It's not very tall, at all. ... So no, 5′3″ at age 12, regardless of gender, is pretty average, sadly.