7 months and 450g is young to start breeding and unless its a project that your really pushing for i personally would wait untill next year. that being said it really early to start pairing i wait untill the weekend after thanksgiving to start pairing. as far as them not eating its common. i have a few that go off feed for 3-4 months after there first pairing and some that will eat maybe once a month and some that keep eating every week like clockwork it just depends on the snake