Isabella had one from abou the end of week 1... she just wanted to be forever sucking and i wanted to sleep!! i was determined not to give her one but thankfully some great friend bought them for me anyway and they saved me my sanity!!! in classes they didnt recommend them till the 2 week mark so as not to get nipple confusion, but we never had a problem.

i agree that you should wait and see but, if isabella wasnt so unsettled i wouldnt have offered it to her.