I lost my mother a decade ago. She came to me in dreams and through those dreams, i was able to come to terms with her loss. Babies in dreams can mean babies or they can mean you are 'giving life to a new project'.

My first reaction to your dream was that it was your friend coming back, to let you know not to give up on the TTC front and that the lack of milk coming in is a real concern for any new mum.

Maybe it's not so much your milk not coming in, but maybe it's more that you have concerns of nuturing/caring looking after your baby when they do arrive? (if that makes sense?) - and these are all natural/normal concerns.

Your friend is coming to you because she loves you and wants you to work through some of the emotional side of TTC/having babies.

This is just my feeling about what your dream meant. I'm not expert on dream interpretation.