I have both.
I think until 2 or nearly 3 yrs they are pretty universal. All different personality's though. There may be a slight 'typical' behaviour from 18 months but it doesn't always follow.
I see lots of lovely gentle quiet boys at playgroups and screaming terrors of girls and vice versa.
Roll onto nursery then the genders (mostly) become apparent. At my DS's nursery, most of the boys are at the trains/cars/dinosaurs and there's alot more fightingcompetitive behaviour.
The girls are all floating about together doing more roleplay.
Of course the odd boy in a pink tutu can run past and a girl with a truck can broom broom by but nobody bats an eye either.
My DS wasn't an overly cuddly baby/toddler. Beautiful (big blue eyes, pouty lips and curly hair, I often wanted to stick a clip in his hair, he would have made a very pretty girl
)!
He was always cheery and looooved people, any people.
I could go to cafe's or we could go out for meals and he would sit happy in a highchair as long as he could people watch.
We once got to sit in Pizza Express when he was nearly 2 and chat, eat and drink wine for 2.5 hours with him just happy to be there
.
DD is 16 months. Will not sit still. Hates eating out. Very very affectionate but if Daddy is around I can go to hell
.
Extremley funny (they all are at this age). She is much more of a live wire, climbs, squeals very loudly
, no fear, generally a bit mad.
She generally loves trains/cars and dinosaurs and does all the broom broom, roar stuff because that's what is lying about and she is watching her big bro. She also loves Dollies (as did DS at her age) and teddies. Very cute too IMHO!!
I know if I had anothor boy or girl id be writing out another completely different person/experience.
My DS is now nearly 4. Much more boystress now but very affectionate now.
Can get very Waaaa, rooooar, doof doof, pssshhh your dead (this is general noises he makes whilst running around like a demented loony at tea time). Then can be very calm, tell the funniest stories with big round innocent eyes and you have to keep a straight face!
Yesterday I was in tears as DD was completely pushing me away and only wanted Daddy. First time i've got upset about it but 1) it was particularly bad yest. 2) my period is due any day now
.
I shut myself in the office and my DS walked in. I tried to get myself together and DS came over, threw his arms round me then asked to get up on my knee. The said "listen mummy, don't be sad, your whole family loves you" OMG, I nearly flooded the room with tears!