People seem to be saying a) hold the cash and wait or b) put it in the market. There is a compromised path that exposes you to both scenarios (though by definition eliminates your ability to get the maximum possible upside).
Compromise: Put your cash in, for instance, Betterment's new 2.69% savings account so that it's at least earning reasonable interest for 2019. CIT online bank is another alternative at 2.4% for over $50k. Both are FDIC insured.
Take 10-30% of your cash holdings, divide by 12 and dollar-cost average your way into the (potentially bulging) market by making identical sized investments every month.
If we see a crash soon you've limited your downside exposure. If we keep growing you've exposed yourself to some upside. Recalibrate in a year or so.
I beleive the prevailing studies are that parenthood is associated with less joy but more meaning in life compared with voluntary childlessness. (Involuntary childlessness is not associated with increased joy or meaning, and is more associated with increased loneliness)
I have 4 years of experience in client facing technical roles (and 3 years of experience in web and retail marketing).
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