29 weeks/ultrasound sucking on cord!

Kat

This is our second baby girl. 29 weeks and 4 days in this pic. She was sucking on her umbilical cord! The tech says baby’s do it all the time for self soothing! I had to google it cause I had never heard of it! Anyone else heard of this or had their bay do this?? She’s cute and a little weird already!