Moms can attest that the relationship with your daughter is different than the one with your son. It's not that you love one more than the other though I have made statements to my boy/girl twins that whoever starts 100 percent pooping on the potty first will be the favorite, the one who I buy the pony or rocket ship for. I'm kidding. Sort of. They are two different beings, so the love is just it's own unique and groovy kind of one. Oh and yes, some people just like one kid more than the other when it comes to certain things.
Breastfeeding was different with both kids as well. Going through it at the same time with twins, made me really see how no two kids are alike, there's no one size fits all answer or solution on how to get a baby to latch, to sleep, to be soothed. The correlation is just different. A new study revealed a link between a mother's production of breastmilk and if her child was a boy or a girl. Guess who we produce more milk for? Hint: It's the one we like more.