I saw this nanny today at approximately 11:30 am in line at the East 70th St. Post Office. She was on her phone, and kicking at the child in the stroller. The child was approximately 2-3, blondish curls a few inches long (though hard to describe more - when she realized that I and another man were paying attention, she began covering the child's head, wheeling the stroller around). The nanny was West Indian by accent, and you can see (vaguely) from the picture below. She became verbally combative when she noticed that we noticed, and began yelling. I paid for the stamp I needed, and her behavior was so erratic, and her kicking at the stroller had also continued, so I tried to take a picture with my phone. The nanny slapped the phone out of my hand, continued yelling at me, cursing wildly, and threatening me that if I tried to take her picture she would make sure I paid for it. I was badly shaken and tried to leave but the nanny followed me with threats and yelling in a very agitated manner. Since she WAS threatening me, I decided exactly to take her photo because she was behaving in such an agitated and aggressive manner - the nanny then blocked the exit I was going to take (down the ramp heading west on 70th st towards 3rd). She began repeatedly thrusting the stroller (with child inside) against walls, then the door, and slapped my phone out of my hand and after I picked it up off the floor I snapped the attached photo. After the incident I realized that a number of my personal photos had been deleted - and damage to the screen, which now has a break diagonally across it. I omitted to note, this nanny also slapped my glasses off.
There were numerous witnesses, only one other woman tried to intervene on behalf of the child (noting that she was shoving the stroller again and again into a door with child inside) and she was also verbally abused by the nanny (she said her husband was fu*%ing his secretary because she was so unattractive). The rest moved away - one of whom said to me, that the nanny was so crazy she was dangerous and just stay away. The nanny left going up towards Third Avenue on 70th.
God help the child in the stroller.
OP was obviously shaken by this incident. After speaking with them, please note: "I didn't specify the gender of the child because from the cursory (before the nanny threw this cloth thing - a blanket? - over most of the kid) looking at the whole child, my impression clothes and all, it was a boy."