Tink you, Mom

Grace and Madeline are both extremely grateful girls, but Charlotte says thank you for things that a 2 year-old should expect in life, and not be grateful for. Telling me a happy, "Tink you, Mom!" for refilling her cup, getting her a snack, or finding her a particular coloring book is sweet, but it makes my heart ache when she thanks me for letting her try to buckle herself in her car seat, putting on her shoes, or changing her wet diaper! Charlotte's sentences have gotten longer and her pronunciation better, and her "Tink you" has changed over the past few weeks to "Sank you." After I gave her more cough medicine and covered her up in the middle of last night, I heard a tired and snotty, "Sank you, Mom." What 2 year-old DOES that!?!