How did he get his nails painted? Did he do it himself or did you or your wife do it? Why? Why is he given pink sippy cups? Is pink the only color available?
I suspect I wouldn't have the problem of wanting to dress up in women's clothes now if my mother hadn't dressed me as a girl and fussed over me when I was a baby and too young to know any better.
I suggest not painting his nails (any color) and giving him other colors of sippy cups. Stop guiding him towards gender confusion. If he decides later, when he is old enough to understand, to be a crossdresser or transgender, that's fine. As it is, your parenting is confusing him and will cause him problems later in life.