Y shaped butt crack on infant 🤔

Jay • Mama to a little boy🐻

My son had his one month well check at the pediatricians today, she mentioned he has a y shaped butt crack and told me they were gonna keep an eye on it. I asked why and she basically just said it’s probably nothing and they were just gonna recheck it next month. Anyone ever hear or this? I tried googling and could only find a bunch of other clueless moms haha the doctor didn’t seem concerned at all but 🤷🏼‍♀️🤷🏼‍♀️🤷🏼‍♀️