my DD is 2 months now and she loves to sleeep with her dummy in her mouth. We bought the Nuk ones as they have a nice silicone shape but the plastic bit at the front leaves 2 red mark on either side of her mouth-it it ok for her to sleep with the dummy in her mouth the whole night? I tried taking it out when i think she falls asleep , but she wakes up as soon as i take it out