Answer: The total weight of the baby after 3 months should be 5.732 kg.
Explanation:
Weight of the Sara's brother =4.1 kg= 4100 g (1 kg = 1000 g)
Rate by which baby should gain weight= 136 g/week
In 1 week baby should gain = 136 g
1 month = 4 week
So, in 3 months = 4 × 3= 12 weeks
So, weight gain by baby in 12 weeks = 12 × 136 g = 1,632 g
Total weight of the baby = 1,632 g + 4100 g =5,732 g = 5.732 kg
The total weight of the baby after 3 months should be 5.732 kg.
