Yes, I will be doing so. I will be speaking English which is my first native tongue all the time to LO, but not sure yet what to do about DH, if we will all speak in English, or if he will speak in Spanish and maybe all of us speak Spanish when together, or the other way round. I know he/she won't have any trouble with Spanish because as soon as they start preschool Spanish will become his/her first language (I've seen many cases and the LO always learns perfectly the language of the country where you live just from going school and living in that country). My friend's daughter had an English nanny, and her and her DH only spoke English to their daughter, all storybooks, tele ect was exclusively in English. When she was 3 she started preschool, and now her Spanish is perfect and her English has a bit of an accent and is starting to lag behind her Spanish. I know that I will really have to keep up the English, promoting English books and films ect, but at the end of the day, I am not sure if their English will ever be as native as I would l like.
My own bilingual situation was different. Born in England, only spoken in English until we came to live in Spain when I was ten. I then acquired Spanish naturally at school though English continued at home. I am now completely bilingual and don't have any accent in either languages (trilingual really as we have a local language (not dialect as it derived from Latin not Spanish) )
When I did my PhD in linguistics I did some subjects on bilingualism, and even read books on how to bring up children in a bilingual environment. Can't remember much now but I will read about come the time.
I have seen many children and adolescents get angry at having to speak a different language to parents or one of their parents, and it can become a bit of a fight, especially as they get older. Some will only respond in the language from the country they live in even if parent speaks in their NL. You have to make clear rules and limits, and make sure the LO sees all the positive points to speaking two languages (when old enough to what to know whys)
I think while you at home, its quite "easy". But once you are at the park, and speaking another language, from that moment it feels like you are creating a barrier between you, LO and the rest of the mummies and LO's. However, if you speak the language of the country you are in, LO might one to extend this to other environments.
Oh, and then what about homework. More than likely it will be me helping them (kids get plenty of homework in Spain), so it would be sooo much easier to switch to Spanish then.
Its something I will give a lot of thought do and I will have a plan of action. I always speak Spanish to DH, so I can't imagine switching to speaking English with him, its just doesn't feel natural. Maybe it will be Spanish as our common language, and English just with me.
I teach English as a foreign language so I know what I am letting myself in for: a lot of bloody hard work! That is if you want them not only to understand, but acquire the vocabulary and grammar of a near native. Gosh, I feel tired just talking about it!