orchidee thanks, I feel hungry every time I'm on MN
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Yes, it's a tricky one, the pump thing. Firstly though, at 6 weeks I would wait another fortnight to let your milk settle down a bit especially if this is your first baby you've breastfed. At around 8 weeks your milk will be more stable and you won't be giving yourself an oversupply.
It's not usual for a milk bank to supply a pump as they are so cash-strapped anyway that they need them for the mums of the preemies in the hospital and can't spare any. They would tend to have hospital grade ones which are uber expensive but very good, and have completely separate pump and collection parts for sterility between users.
You can hire one from your local NCT group (www.nctpregnancyandbabycare.com/branches) although it's not cheap. They're great though, really quiet and very, very effective.
In terms of buying one, in my experience both personally and with my donors, I find electric pumps to be the most effective generally. Lansinoh do a double pump which can be quicker, but I used one myself and didn't find the suction to be great when double pumping, and anyway I preferred to pump at the same time as feeding so mostly only used one side. Medela have a good reputation and I've had one of the older style single collection Medelas which worked well for me, too.
I would start off trying to learn hand expressing. If you've an NCT BFing counsellor nearby they will (free of charge) teach you to do this. Or a local baby cafe or breastfeeding group may be able to. You may find that you get on really well with it and don't need a pump at all - bonus!