hi the best place to get info on chi weights is too look at a chi weight chart
theres plently on various websites taken from the same source http://www.ahkennel.net/weightchart.htm heres a link to the chart.
according to the chart if your puppy was going to take after its parents in weight it should be around 31 ounces now. however the younger the puppy the more inaccurate the chart normaly is. I found it quite accurate when i was tracking keeks weight gain.
Remeber though the puppy is not necercairly going to be the same size as the parents