Hi hope this helps! ^^
A small family can be more healthier than a large one could be because attention, discipline and food supply. A family with two kids will get more attention than an family with 4-10 because parents may not have enough time to pay attention to every child. Discipline will not be as good for 4-10 children because you can’t keep track of what every kid is doing, if you do it’s hard, so if you have 1-3 kids you can discipline them better meaning they are healthier because they won’t go swimming in a lake or etc. The last one is food supply. The larger the family the harder the bills, money, and food. If you make around 500 a week that will not work. Because you can only buy bills with that! Kids also want phones, iPads etc. And parents have to worry about Christmas as well. Food supply will be lower and meaning less healthier.
( I would appreciate if you gave brainliest if I helped you, if not please let me know what I got wrong! If you need any more help do not hesitate to ask! :) )
