Fluid in baby belly at anatomy scan

Jesse • 5-15-13 👦🏻 10-20-16 👶🏼 July 2017 👼🏻👼🏻 7-8-19🌈 👶🏼 boy mama 💙💙💙

So my dr informed me over the phone today that the scan showed a dark spot in the baby’s belly which possibly meant there is excess fluid in his belly. They want me to follow up with further ultrasounds to find out what it is. They want to make sure baby is sucking and eating in the womb. She called it something and I asked her to repeat it twice, but couldn’t remember the name. Exo something. Anyone else deal with this? Know the name? I don’t go in for another week and just need more info.