Mom is 3 1/2 to 4lbs lactating, dad is 5lbs, puppy weighed 2.5 oz's at birth. Puppy will be 6 weeks old next week and is still under 1lb. Can you all give me an guesstimated idea of what the adult weight may be? I don't know the formula or how to figure it out.

Hope I explained that correctly. Thanks