When a baby just stares at you... GIF

I have a 4.5 month old brother, and every time he stares at me (which is often) I do this and then pull the most grotesque looking face I can imagine. The first time I did it, he started crying. Now he just laughs, though.

Omg, my niece does this all the time! And she is just absolutely adorable, but when I go and try to pick her up, she starts crying like there's no end. Like, fine. -.-

My little brother always stares at every guest that he hasn't seen before.

Huh. When babies see me they cry. Which makes me cry.