Whether the 10 year rule applies to an IRA inside a trust is something I would research; it might be different for that situation.
As for your question, the trust can generally distribute income to the beneficiary of the trust each year as long as that distribution meets the terms of the trust and any applicable state laws regarding trusts. And yes, if it does so, the trust gets a deduction for that amount, and the beneficiary then pays taxes on it on their tax return. Google "distributable net income" and "1041 K-1" to learn more.
The laws could change, I agree, but the DNI / K-1 stuff has been the case for the last seven years at least.
You could also just leave the IRA directly to your child. If you (both) die while the child is still a minor, the court will appoint a custodian (you can recommend a custodian in your will) to manage the money on behalf of the child until they reach 18 or 21. The only reason I know of to do a testamentary trust is if you want to delay that distribution past 18/21 (like to 25/30/35/40 or whatever).