I had three bags. One for labour, one for me when I got back on the ward and one for baby. ff the top of my head this is what I took:
Baby:
Vests / Body Suits
Sleepsuits (in various sizes, new born may not be big enough)
Scratch mitts
Hat
Nappies (although my hospital provided them and check about formula if you're not breastfeeding)
Me:
Three nightshirts (they got messy real quick and were easily binned)
Thick socks / slippers
Glucose / energy tablets
Bottled drinks with sports cap
Hair bands and grips (more than one as the one you use is guaranteed to snap)
Snacks for birthing partner (mine went on for over 24hours and he was starving and tired bless him)
Hospital stay:
Night shirt
Big knickers (10 big pairs from primark for �4)
Snacks - I found it helpful to have bananas and little bottles of juice, crisps, and things I could nibble on as I didn't fancy much
Dressing gown and slippers
Toiletries and toothbrush