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In what US state did this occcur?
Bail is at the discretion of the judge, and even though your son is a first felony offender, this is a burglary charge, and it is serious. Judge's determine bail based on the seriousness of the case, the strength of the state's case, the personal and criminal history of the defendant, whether he has ties to the community and whether they have evidence to believe he will be a flight risk.
I cannot say whether the judge abused his discretion without hearing what argument the state made at his arraignment and what his lawyer, if any, and the judge put on the record in return. However, bail can be reviewed at any time. So when your son has a lawyer he can ask for a lowering of bail conditions, if there are favorable facts that would support it of which the judge was initially not made aware.