Alright, here is a simple tip to help your child say the L.
*1-Have child lightly bite down on their tongue and say, "LLLL".
2- The perfect technique is to have the child slide their tongue up behind the top row of teeth and say the "LLL" sound, but some children need the first step in order to get to #2. They will get it if they practice. The book, "Lovely Lily" helps the child practice the "LLLL" sound with simple L words and then slowly add L words in the middle and ending positions. It's a fun way to practice the L with your child