Final answer:
To find the total weight in ounces, we convert the pounds and ounces to ounces and then add them together.
Step-by-step explanation:
To find the total weight in ounces, we need to convert the pounds and ounces to ounces and then add them together. Since there are 16 ounces in a pound, we multiply 7 pounds by 16 to get 112 ounces. Then, we add the 12 ounces to get a total of 124 ounces. Therefore, Baby Kelsey weighed 124 ounces in all.
Learn more about converting pounds and ounces to ounces