When babies refuse food, it does not raise eyebrows. It is quite a common sight. In fact, some babies are picky eaters, while others take time to transition from milk to solid. However, this is the case of baby Eli, also reported in the Washington Post, who persistently refused weight, started losing weight and was diagnosed with something life threatening. Jessica Dizon, his mother, as the Washington Post reports knew something was wrong. Eli had always been a good eater when it came to breastfeeding, so his rejection of solid food at four months wasn’t an immediate cause for alarm. However, as months passed, his aversion to food intensified. He gagged at the sight of a spoon, choked when attempting solids, and even refused formula. By the time he turned one, Eli was not just refusing food—he was regressing developmentally, losing weight, and becoming increasingly lethargic.CHECK THIS OUT: Woman Discovers She Was 4 Months Pregnant Days After Giving Birth—Doctor Explains HowA Growing ConcernEli's pediatrician initially also reassured Jessica that there is nothing to worry about as babies do take a lot of time to adjust to solid food. Jessica was recommended patience and occupational therapy to help with the feeding. However, the therapy didn't work and Eli continued to reject food. He also became increasingly weak and started waking up frequently at night to breastfeed. It felt like he was trying to compensate for a nutritional deficit that he or his mother did not know existed. Jessica, juggling work and three children during the pandemic, grew increasingly anxious. Her baby wasn’t just a picky eater—he was deteriorating. At 10 months, she took him back to the pediatrician, who finally ordered a blood test. The results were shocking: Eli was severely anemic, with dangerously low vitamin B12 levels.The Cause Of DeficiencyVitamin B12 is essential for brain development and the production of red blood cells. While deficiencies are more common in the elderly or in those with strict vegan diets, they are rare in infants—except in specific cases like Eli’s.Eli’s B12 levels were almost nonexistent, but the bigger mystery was why. Typically, breastfed infants receive enough B12 from their mothers unless the mother herself is deficient. That’s when an essential clue emerged—Jessica’s own medical history. At 14, she had been diagnosed with Hashimoto’s disease, an autoimmune disorder affecting the thyroid. Unbeknownst to her, Hashimoto’s can lead to another autoimmune condition called pernicious anemia, which prevents the body from absorbing B12. Without realizing it, Jessica’s body had been unable to pass the necessary vitamin to her baby through breast milk.Once the diagnosis was clear, Eli received immediate B12 injections within 24 hours. The way his body reacted was incredible. Just with one injection, he stopped vomiting, regained his energy, and began eating solid food. His developmental milestones, which had been stalled for months, quickly caught up. Jessica, too, started B12 supplements and noticed an improvement in her own health, which had been declining unnoticed for years.Eli’s case, later documented in a medical journal, highlights a crucial yet often overlooked issue: B12 deficiency in breastfeeding infants. Research suggests that many women with autoimmune thyroid diseases may unknowingly develop pernicious anemia, leading to undiagnosed B12 deficiencies in their babies. Pediatricians, Jessica’s included, admitted they had never encountered such a case before.