I suggest seeing if you can foist the baby on someone for a half hour twice a week and then clearing your reviews queue during the time your review level stabilises (could take anything between one week and a month). Don’t do any new lessons until your apprentice items are at 15 or lower, and then don’t do any new lessons if the lesson will bring over the 15 apprentice items.
You can set the lesson batch size to 3 in the settings. You can do a single batch of lessons a day 2-4 times a week depending on your level once you feel ready to get back to them.
I’d also really recommend changing lesson order to the setting “ascending level then shuffled” in the settings. The danger of being very slow with lessons/reviews is that you would forget readings and meanings of kanji and radicals since you wouldn’t see them used in context. Ascending then shuffled shifts the focus slightly towards vocabulary, which you’re going to need much more than any speed leveller.
All that’s said, I’d try doing 10 reviews several times a day. At least twice, if you want to be able to get yourself to a lighter workload. Use the wrap up button as much as you can, and keep in mind that you can get back to half done, abruptly left reviews for someone like an hour or two (if you’re using the same device and browser). @viet should be able to tell you the exact time.
Good luck, and congrats on the baby! May the little kidling become an adult that you enjoy spending time with!