You have to do glitches to get access to either another strength upgrade (silver or golden gauntlets) or you can get bombchus form either the Bottom of the Well or the Spirit temple.
To get the silver gauntlets or bombchus from the spirit temple without ever becoming an adult, you would have to perform many glitches. In order to get either bombchus or silver gauntlets, I recommend you have the slingshot and some deku sticks. http://zeldaspeedruns.com/site/index.php?link=oot/majorsb/early_spirit_temple_child
The golden gauntlets are impossible to get without becoming an adult, so those are out of the question.
You can also get bombchus from the Bottom of the Well. To do this, you would also have to perform many glitches, which can be found with explanations at this url: http://zeldaspeedruns.com/site/index.php?link=oot/earlyitems/earlybombchus