
Also weigh them and keep a chart of the weights.
At first weigh every day to ensure they are gaining (or don't loose more than an ounce in first day or two).
After that weigh every few days and after two weeks each week. If the weight gain slows you will have a clue that something is up, or that it is time to help out by starting weaning.
If any pup seems not to be getting their fair share make sure to plug them onto the best teats every time you pass by. Do not resort to topping them up with formula unless you absolutely have to.
Mum will need lost more food and very soon will want three or four times the normal amounts.
To be hones I let my girls eat as much as they want offered at least four times a day in their beds at first.
I would start interviewing prospective new owners asap so you can get to know them and assess which pups are likely to suit which owners.