Weird measurements at ultrasound 36 weeks

So my little one wasn’t moving much for the past few days. We decided to a an ultrasound after visiting my midwife just to make sure he was okay. Thankfully, he was doing just fine. He had changed his positioning so I couldn’t feel his arms or legs as much. The ultrasound tech did a few measurements, his head is measuring at 33/34 weeks. His tummy at 36 weeks (his actual gestational age) but his legs are measuring at 37 weeks. Any other mamas out there who got weird measurements. The tech said it’s nothing to worry about but all I’m thinking is, is my baby going to have a teeny tiny head with a large tummy and extra long legs ?