@DtPeabodysLoosePants two of the most fundamental pieces of a person's identity is their name and their sex, the latter of which is so important that it causes discussion on threads such as this one. By finding out if I was having a boy or a girl I was able to know the sex of my child, and as a consequence be able to address them by one of the two names we had chosen. "It", "the baby", "the bump" became "her", "she", and "DD's name" and the concept that I was soon to be a mother became a little bit less abstract knowing I was going to have a "daughter" rather than just an as yet undefined child.
Knowing the sex of your child is so important it is literally one of the first things you get told after their birth, I simply chose to be told it 20 weeks earlier than if I hadn't found out during a scan. Personally, I can't stand not knowing things, if there's a riddle or maths problem and I can't crack it, it bugs the hell out of me until I know the answer, NOT finding out the sex of my baby when I had the chance wasn't something that ever appealed to me.
Finding out we were having a girl while I was pregnant made both of us think more deeply about our attitudes toward the different sexes and we had (and still do have) many discussions about how we wanted to parent our daughter. Dp was oblivious to the differences in children's clothes for boys and girls and was amazed at the pinkness of clothes aimed at girls once I pointed it out to him.
When I said, "I wanted to know a little bit about the person I was growing..." I was not implying that their sex would tell me about her favourite colour or if she would be good at Maths when she was older I was talking about how having a boy or a girl might affect our family dynamics, how we would parent them, and importantly how their biology would impact on potential medical and emotions issues throughout their lives. I think it is probably more accurate to say finding our the sex gave us the opportunity to know more about ourselves as people and future parents within the context of having a daughter (or a son if that had been the case).
DP (male) and I have conditions which have genetic links, mine is strongly influenced by female hormones whereas his condition presents very differently in boy compared to girls. Knowing our child's sex enabled us to have discussions about medical things relating to potential problems we may encounter in the future and talk about their anatomy in terms of nappy changing, hygiene, potential illnesses. Dp grew up with sisters so knew all about cystitis, thrush, periods, wiping front to back, etc, but having grown up in a house with no brothers, and from an early age no father, I am definitely lacking in knowledge about young boys and how to look after their genitals. Had our scan showed I was having a boy I would have been able to ask dp to help prepare me for looking after and toilet training someone with a penis.
Thinking about it know I can't think of any way that DP treats our child that is specific to her being a girl. I am a bit more active in discussing everyday sexism and empowerment for women (as much as you can to a 3-year-old). I am glad we had the chance to figure things out a little bit before having an actual baby to look after, that was overwhelming enough! My concept of the child I was going to have was developed during pregnancy, and probably further back to before we were even trying to get pregnant but every piece of information I got about her took me one step closer to meeting her in person.
My path to motherhood has been very deliberate. Dp and I planned when to get pregnant, we planned what names to give, we wanted to know as much information as we could before the birth and finding out the sex is all part of that and was just our personal preference. We are both scientifically minded so learning as much as we could when we could was just our natural way. Now that our dd is here it is up to her to guide us who she is and for us to listen to her.