What is the normal weight for a 3 year old baby?

Varies= length/sex. We can provide more info when you provide more background information.Without the length and gender we cannot provide a specific range of normal weight.
Weight for 3 yo. Healthychildren.Org is a very important resource for all pediatric questions including your particular issue. Here is the growth chart: http://www.Cdc.Gov/growthcharts.