A study published in the journal Pediatrics details the case of a young baby in Spain who for eight and a half months lived on an "exclusive intake of almond beverages and almond flour." As any mother (or most humans) could guess, this diet was not healthy for the baby.
A doctor suggested the baby, then two-and-half months old, switch from a cow to almond milk formula after exhibiting skin rashes, the Washington Post reports. For a few months, everything was normal. However, at six months the baby began repeatedly rejecting vegetable and fruit purées. A month later, there were signs of deterioration. At first, he "showed less interest in interacting and was more unstable when sitting."
By month 11, there were some vary scary signals something was wrong: he wasn't walking and cried when someone touched his legs. It turned out that his diet has deprived him of vitamin C to such a point that his legs were broken. The baby's broken legs, mood, and "failure to thrive" were symptoms of his incredibly low vitamin C level. His vitamin deficiency meant he had contracted scurvy, a disease more often associated with pirates or voyagers traveling pre-1900 than modern-day babies in countries such as Spain.