Is it safe to vent sex an Embden gosling at 7 weeks?

[LittleLakesFarm]

Is it safe to vent sex an Embden gosling at 7 weeks? If not, can you suggest anything that can help me to decipher the gender? The gosling in the photo is the one in question. I have some experience vent sexing ducks & ducklings but never a pre-teen gosling. If anyone can offer any tips for venting or any other helpful information I would really appreciate it. Any help is very much appreciated.

Hoping For A Female For My Lonely Gander, "Clarence".

 

[Bailey1204]

It is safe to sex duck,goose,chicken,quail, etc chicks from day one.