Respond, please: on what earliest term by results of US it is possible...

[Diana]

Respond, please: on what earliest term by results of US it is possible to define or determine: 1. A floor of the child; 2. Possible or probable deviations or rejections at the child. Thanks.

[Oshchepkova S.R.]

It is better to look in term 18 - 24 weeks.