When we adopted him at one year of age he was 30” tall and weighed 30 lbs (a right stout little lad). Needless to say we NEVER made him sit in a rear facing seat.
He’s nine years old now and is 4’-9” tall and a little under 90 lbs. He has not used a ‘child’ seat of any kind since he was 7.
Future slugger or football star perhaps ;D! I don’t envy your grocery bill in the next 10 years. He’s a big fella.