One of the interesting and unexpected things that being a parent means is that while you are watching over your child, your child is also watching over you. They notice more than you would expect, little things about you that you may not even know about yourself. They are using you as their guide for life as they work out how the world works. They learn how you deal with life's challenges and problems. They notice how you become frustrated about some things yet not other things.They work out what is valuable to you and what things don't really matter. They soon learn to imitate you and they won't be very old before you hear them saying the things you say and pulling the same expressions, even showing the same body language.
It's not until they are much older however that you realise the depth of this watching that has occurred. It's way more than an imitation of you. It's a recognition of what you value and how you feel about a whole range of things. When they become adults you may be lucky enough that they feel they can tell you what they notice. You may be confronted as they comment on your inconsistencies or your intolerances.These may not be want you want to hear. These are private and not the way you necessarily wanted to portray yourself to others.
All of that watching has been important - your watching kept them safe and healthy. Their watching of you has helped them become who they are today. Their ability to tell you is a reflection of the trusting relationship you have been able to develop. So learning to embrace this and use for your own ongoing self reflection will not only help yourself but also deepen your relationship with your child.