Work at home moms with no helper and with more than 1 kid, how do you manage your day-to-day activities?

I suggest you stick to your time frame. Plan to finish things in an x span of time and as much as possible, finish what you can. This way, you can be more productive without really noticing it. Example, in the morning, I make sure I finish preparing breakfast and load the laundry at 7 am, feed the baby and bathe until 9 am. Make her sleep at 9 onwards. During sleeping time, that's when I need a super mommy boost, haha. I take a bath, line dry the laundry and prepare lunch. So on and so forth. It's been effective for me :)