A Baby Weighed $1$ Lb $3$ Oz at Birth

A baby weighed $1$ lb $3$ oz at birth. By the time the baby was 12 months old, its weight was three times its birth weight. How much did the baby weigh when it was 12 months old?

A) 3 lb 8 oz
B) 3 lb 9 oz
C) 4 lb 10 oz
D) 2 lb 8 oz
E) 4 lb 9 oz