Is This a Boy or Girl Budgie? Please Comment!

As we named our budgie Disco and hoped he would talk, we were wishing for a male budgie. But we also wanted to get him/her as young as possible. If I read correctly, you can't tell the sex before they are 4 months old. Now a nice person here on Dailymotion told me, she is 90% certain it is a girl. Here are now bright daylight shots, so she can take another look and all you other budgie experts, please share your wisdom and comment. Thanks. Oh and if you have time, please subscribe ;)
Ist dieser Wellensitich maennlich oder weiblich? Bitte kommentieren ;)
Muessen wir ihn umbennenen?