What are the similarities between having kids and doing startups?
First of all, babies don't come with a manual. When you get a first child, you are usually unsure of anything new that happens to them. Every stage is fresh and unknown. You are also more gentle and cautious when it comes to caring for the new baby. Slowly, over time, you begin to figure it out. Then, when you have a second baby, you are more at ease and comfortable with it. Startups are very similar in that way.
Second, as far as investing, you might not know the results for a couple of years or a decade. Same with children. You put all the energy without knowing the outcomes for a very long time.