this is how I do all of my boas.
1st shed until 1 year: every 7 days
1 year to 2 years: every 10 days
2+ years old: every 14 days
breeder females get every 10 days for the duration of the pregnancy and for all of the mating season if they eat.
breeder males will also go on a 10 day schedule if they loose weight during mating
some of my animals just seem to gain weight even on a 14 day schedule and those I will feed 14th day then wait 21 days and feed and rotate like that.
honestly you shouldnt need to give a baby 2 prey items. 1 item just large enough to barely leave a slight lump. Really you dont want to see a lump at all but a slight one would be ok.