From: https://www.westonaprice.org/.../dietary.../... 

Photo by Michelle @Shelby Captures It on unsplash.com 

Growth 

Pediatric clinicians noted a number of years ago that children who were put onto low fat and low-cholesterol diets failed to grow properly. It seems that during the critical growing years, children need levels of fat substantially in excess of the levels recommended in the US dietary guidelines. After all, mother’s milk contains 55 percent of calories as fat, much of it saturated fat. Children need high levels of fat throughout the period of growth and development. Milk and animal fats give energy and also help children build muscle and bones. In addition, animal fats provide vitamins A and D necessary for protein and mineral assimilation.

NOTE - While bacon has a lot of good animal fat, not all bacon is made equal. You want to find bacon that is cured without nitrates. Look for uncured and naturally smoked.