I almost always take a peek. I'm just too impatient to wait for them to grow up. Especially since I make such slow progress these days lol.
Like I've had the same baby/toddler in my game for literally 2 years (and a bit)... I wouldn't have made it 2 years without a peek. Though it has been 2 years since I took a peek so... it's pretty much a surprise now anyway, my memory's not that good. Just kidding, he's the spitting image of his mom and his grandpa, I won't forget how he looks.
I also like to make adjustments based on that. Not like anything major, just like adjusting jaw widths and stuff like that if they take after the opposite gendered parent since that often doesn't transfer well, so I try to adjust it to more realistic proportions. But I prefer to do that early on instead of just changing my sims appearance later on when it's noticeable that I've done so.
