Hi I’m a 13 year old boy who’s underweight and short I am 4 foot 5 and 73 pounds how many calories should I eat to gain atleast 0.25 pounds of lean muscle mass a week

i think your fine if you love your body then your good no need to change

Explanation:

protein makes up the building blocks of organs, muscles, skin, hormones and pretty much everything that matters in your body.

some choices are:

peanut butter

seeds

eggs

yogurt

meats

fish

so pretty much meat, dairy, nuts, and grains.