I thought I'd do an updated comparison between OPI's In The Spotlight Pink and It's A Girl, as they look identical in their bottles! Spotlight is shown on the middle and pinky here, Girl is on the pointer and ring. Two coats of each. As you can see they are in the same colour family, it's just that Girl is milkier, giving you more coverage.
This is a swatch of OPI It's A Girl, two coats.