I think all moms have an ideal in mind. Mine was 2 kids, 3 years apart. Boom! Like clockwork, the first time we tried for both, I got pregnant 3 years apart. Then we decided maybe we wanted another after 3 years. And we tried and tried and tried and gave up. Then next month, I was pregnant at 35. Surprise!
When my youngest was 7 and my oldest 10, we had our bonus baby! And that was it, I figured. 3 was plenty. We waited a long time for #3 and I cherished every moment of his babyhood. The age difference is awesome, because my daughter was so helpful and my son isn't jealous of not being the "baby" anymore. I figured my baby-making years were over and I just got lucky with #3 (who is 15 months old). But nope! Shortly before my daughter's 12th birthday, we will welcome #4. Extra, super, special surprise!!! Anyway, personally, I loved the 3-year difference. And the 10 and 7-year difference. I suppose I'll also love the 12, 8, and almost 2-year difference, too

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All that to say, whatever happens, you can make it work

There's no one-size-fits-all ideal. And anyway, you just never know what will happen!