My three year old has developed the habit of sucking her bottom lip. It’s getting really sore. She was sucking her thumb but switched to her lip. I’m worried about her teeth being pushed forwards and her lip looks so sore. How can I encourage her to stop. These habits only started when her little brother was born. he’s 8 months now. We make sure she gets plenty of attention and cuddles. We have designated special time with mummy and daddy every day. Any tips or advice welcome.