I have exactly same dilema in march!! DS2 will be 2 and 1/2 months and BF (DS1 still BF also but he will be fine) I dont get much when I express so cant really have a bottle of EBM for him also not sure how I will mange in the dress.

I have issue of needing to have dress fitting when hoping to loose weight before then, and also the timing of feeds so that bub will be settled when he needs to be eh ceremony and pics.

Its my brothers wedding and he has invited my best friend so that she can look after DS2 for me as I dint want my parents to risk missing anything due to him being upset (DH and DS1 are also in bridal party)

Depending on where wedding is in dandenongs there may be a room for you to feed in as we got married at lyrebird falls and my best friend/matron of honour was BF and she sat in there to feed as she had to half strip due to dress.