Depending on if and where the child is outside of the US, the turnaround is quite often less than 15 business days nowadays when using State's facilities outside of the US. This is about 4-7 business days worse than what I've frequently seen (in prior years) at embassies in cities with pretty convenient flight schedules to the US.

State's facilities inside the US aren't necessarily as readily available for such quick turns since there's the issue of whether or not the applicant is even qualified for in-person services with State's own people as application acceptance agents at such facilities.

Speaking of passport acceptance by say the USPS's passport application acceptance staff or other contracted acceptance agents, make sure to double check that you've done the proverbially dotting of the i's and crossing of the t's for the DS-11 application nowadays before they say you're good to go. You don't want the application to be hung up because an acceptance agent got something wrong, since then you may be stuck with finding out via a letter or email that they need a fix from your side before they can issue the passport. Those kind of mistakes will drag things out.