Instruction: Parse the product information to locate the target attribute, and then provide the extracted value of the target attribute and its source in the output, specifying None if the attribute is not present.

Input:
Product title: Boys Letter Cotton Short Sleeve T Shirt Kids Crew Neck Tee Top
Product description: Great for baby wearing, casual, sports,home Size 1 inch = 2.54 cm Size 90CM( 18-24months /height about 90CM ): length 35 CM,bust 54 CM Size 100CM( 1 -2 years, /height about 95CM ): length 37 CM,bust 58 CM Size 110CM( 2 -3 years, /height about 100CM ): length 39 CM,bust 60 CM Size 120CM( 3 -4 years / height about 105CM ): length 42 CM,bust 64 CM Size130CM( 4 -5 years / height about 110CM ): length 45 CM,bust 66 CM Please note that ,there is 1%-2% dimension difference due to manual measurement. The age is just for your reference. Please check the size chart detail before ordering.
Product feature: Brand new and high quality, Material :95% cotton,5% polyester, Short sleeve, young and free letter print, Suggest Age: 90CM for 18-24 months , 100 CM for 1 -2 years, 110 CM for 2 -3 years, 120 CM for 3 -4 years, 130 CM for 4 -5 years, Please consider kids height and weight when choose size, Shipping Information: View shipping rates and policies, ASIN: B01CRY0TVQ, Date first listed on Amazon: March 10, 2016, Average Customer Review: 5.0 out of 5 stars 2 customer reviews
Product price: $19.98
Product brand: Lily.Pie
Target attributes: Neckline
Answer: attribute: neckline
value: crew neck
source: product title