Not knowing what sax you have or the mouthpiece that will be attached it's a little hard to make an 'educated' recommendation.
I've started a few dozen little sax players. Most were using a Yamaha 4C or similar. They seemed to manage very nicely on a Rico Orange box 2.5
They are, in my opinion, very consistant in quality and 'kid' friendly. Parents love them because they don't break the bank when they have to buy an new box every 2 weeks.
Those beginners seem to 'eat' through a reed every other day.
I did have a student that came to me with an old Buescher alto with the original mouthpiece. It had a closer tip opening than many of todays' 'student' mouthpieces. I started him out on a Orange box 3 and went from there. So you see, reed strength is dictated more by the tip opening than the level of the player.