pictogram design

1977 E12 A F0 F8 4215 8855 E183 B7 E9 FE3 A 4 5005 c
1977 E12 A F0 F8 4215 8855 E183 B7 E9 FE3 A 4 5005 c

Interesting field (bit niche): how do you design icons and pictograms that are recognisable, communicate clearly to the widest possible audience, and yet have something of their own?

Question for example: why is the baby's head filled in, the parent's not? I think it's a good choice because it gives the baby's figure more "weight", literally and figuratively, it doesn't get so fussy in that area. The visual balance is also better this way. And you have more distinction between child and parent this way.