Definitely feed on a 5 day schedule at that age. 10 days is far too long for such a young snake. We don't even feed our adults on a 10 day schedule. Growth rates vary depending on a lot of factors like gender, feeding response, genetics, etc. A good eater with a proper feeding regimen you can expect between 800-1,200g for a female and 500g+ for a male by their first birthdays. The general rule of thumb that most breeders swear by is 10-15% of your snake's body weight every 5 days for younger snakes and every 7 days for older snakes.