Instruction: First, identify the target attributes from the provided list. Then, scan the product title, description, feature, and brand to extract the values associated with each target attribute. Finally, create a list of dictionaries, each containing the extracted attribute, its corresponding value, and the source where it was found.

Input:
Product title: Threadrock Little Boys' I Choo Choo Choose You Toddler T-Shirt
Product description: Our super comfy toddler tees are sure to be a hit with everyone, especially your little one. This exclusive Threadrock design is available on multiple size and color combinations; available sizes and colors are selectable. Tees are 100% preshrunk cotton and fully machine washable.
Product feature: Threadrock exclusive, Unisex tee, appropriate for toddler boys or girls, 100% preshrunk cotton; ribbed crew neck; taped shoulder-to-shoulder; double-needle hemmed bottom and sleeves, Available sizes: 2T, 3T, 4T, Shipping Weight: 3.04 ounces, ASIN: B00HRM6P3K, Item model number: TK00225-060515, Date first listed on Amazon: January 9, 2014, Average Customer Review: 4.5 out of 5 stars 7 customer reviews
Target attributes: Age Group
Answer: attribute: age group
value: toddler
source: product description
attribute: age group
value: 3
source: product feature
attribute: age group
value: 3t
source: product feature
attribute: age group
value: toddler
source: product title
attribute: age group
value: 4t
source: product feature
attribute: age group
value: 4
source: product feature
attribute: age group
value: toddler
source: product feature
attribute: age group
value: 2t
source: product feature