The American Pit Bull Terrier and similar breeds may continue growing until they are two years old, according to the Daily Puppy. Full-sized female pit bulls generally weigh between 30 and 50 pounds, whereas full grown males weigh between 35 and 60 pounds.
The average height for a full grown female American Pit Bull Terrier is around 17 to 20 inches. Full grown male American Pit Bull Terriers are around 18 to 21 inches tall, states the Daily Puppy. American Pit Bull Terriers will usually stop growing between 1 and 2 years old, according to PitBulls.org. During this time, an American Pit Bull Terrier will reach its full physical and sexual maturity.