Accidentally gave baby expired ready to use formula

Hi, I have been using the ready to use liquid 2 ounce bottles of formula when we are on the go out of the house and I just realized that the last box I opened has a "use by" date of April 1, 2021. I know the previous box was okay because I remember it being 2022 but I just didn't check the date on this box I opened. He has had a few of these bottles over the last few weeks here and there. I feel horrible for giving it to him, I know now to always check the date first...makes me mad that these expired before I even bought them.. I'm worried, will he be okay? What should I look for? Risk of food poisoning?

Please let me know

Thank you