Answer
14$\frac{1}{2}$ lb
Work Step by Step
Given the baby weigh 7$\frac{1}{4}$ lb at the time of birth,
Baby wiegth got doubled after 3 months
We need to find the baby's weight after 3 months = 2 x 7$\frac{1}{4}$ lb
= 2 x $\frac{29}{4}$ lb
=$\frac{29}{2}$ lb
=14$\frac{1}{2}$ lb
