Growing up in Querétaro, Mexico, María was an exceptionally bright and inquisitive child. At just 18 months old, she spoke at the level of a 6-year-old, and could even sing the tongue-twisting “Supercalifragilisticexpialidocious” song. Her parents marveled at her intelligence at such a young age, but there was something in her development that seemed off.
“At 1 year, she wasn’t crawling well and had difficulty standing,” her mother, María José, recalls. “She hadn’t learned to walk by 18 months, and she would crawl by pulling her two legs at the same time — like a little bunny.” Her parents knew that something was wrong, so they took her to see a pediatrician in their home country of Mexico.