i never chose to breastfeed as such, like louandivy, it never seemed an option for me to formula feed - i knew formula would only ever be a secondary option if i had problems breastfeeding.
as i was studying at university when i fell pregnant it was originally planned that i would have to return 3 weeks after oliver was born so while i was pregnant i had to accept that i probably wouldn't be able to breastfeed because of this. what actually happened is that i suspended my studies for another year, mainly due to this reason. i wanted to be able to breastfeed him and as i had encountered no problems i figured it would be silly to give it up to go back to uni (i wasn't ready to return anyway, but breastfeeding was a huge factor in it).
my mum is VERY pro breastfeeding and she breastfed my older brother for 4 years, myself for 2 and my younger for 3 years. she did all of this while working full time as a social worker, and coming home on her lunch breaks to feed. breastfeeding, i suppose, just seems normal to me. (there isn't actually much about my upbringing which i haven't adopted - my mum and i are very similar in our parenting styles).
i was worried when i was pregnant that i wouldn't want to do it when he was born, but actually, it was the first thing i did (i actually asked the midwife's permission i could feed my own baby - haha!). i'm so proud of how big and chunky he is all because of my milk.i guess overall i wanted to because it is the normal thing to do, and as i didn't encounter problems, i saw no point in using an alternative when the original is readily available.
it's best for him and totally best for me.