Note: interns who need more than a few minutes of hand-holding each day after being brought up to speed on the project (which is an initial significant cost) are non-starters in a startup that's got one full time long term technical employee.

One of the major objectives of many internships is to learn how to do a job, any job. It doesn't sound like a company of this size can afford interns of this nature.

BTW, who's idea was it to staff up with interns? Are they going to leave in August? December/January?