As often as baby would suck sweets. Around every 2 hours, but to keep up a supply, you will most likely have to express through the night too, around every 3 hours for now, but you can drop one of those as she gets bigger.....

If you plan on doing this long term, you will need a good electric double pump.... and I am MORE than happy to post you my Ameda Purely Yours... worked full time perfect for 10 months....

You may find a drop in supply after 6 weeks, which is very common with a bubba not at the breast, but if you are happy to take meds if it happens, you can express as long as you want too.....

WELL DONE on deciding to express, its hard work, but SOOOOOOO rewarding babe!!!