
I agree with Brainless.
The more frequently they suckle the more milk she should produce. Same as humans.
I would suggest putting the pups on mum at least every hour - put them all on together for maximum stimulation.
Don't supplement them unless they are looking dehydrated and loosing weight.
Make sure the dam is eating frequently and drinking enough. Formula in her drinking water helps.
24 hours of this should bring her milk in well and truely. If not, then something is not right and you will have to supplement.
JMHO