I also read that and looked into it (google) they say your baby can start to express emotions as early as 28 weeks (WebMd) that is sad though we don't know if they are crying and can't do nothing
They do express a lot of emotions but I'm sure they don't cry they are comfy n cozy in there little water bed homes until they are in your arms! They are relaxed in there my baby was using my placenta as a pillow & I saw him for 30mins on 3d ultrasound he was smiling & yawning & kicking & punching just trying to be a comfy little bear. But they wouldn't cry they are surrounded by water they are happy don't worry!
Yes its true saw it on YouTube