Hi all I am new to this and would appreciate some advice I have about a million questions ;-) firstly some background, I am a first time mum to a gorgeous little boy of 12 weeks he is exclusively breastfed and is doing well gaining weight and sleeping through the night. However, I wanted to get into expressing and offering him a bottle as we have a few things coming up that I will need to leave him for and want to know my mum can give him a bottle if he is hungry before I return also to build up a supply for when I go back to work. So after reading hundreds of reviews I went out today and brought a medela swing and calma. It is washed And sterilised and ready to go but I wanted to know can I express now and offer it today? I have just fed him at 4pm so he will be hungry again at 7pm can I express before then and offer it to him tonight? -was going to get my partner to offer as I know he may not want it from me. How will I know if I have expressed enough for a feed? How much should I be expecting to get? I don't want to not have enough- offer it then he need topping up from my boob. Any help and advice you can give much appreciated. Also to anyone who owns a swing can u wash and sterilise tube? It doesn't mention that in instructions. Thank you