Children notice things adults walk past: a shadow that changes, a leaf with an unusual shape, or a sound they cannot place. A question is an invitation to look again.
You do not need an immediate answer. Try saying what you notice, asking what your child thinks, and deciding how you could find out together. A book, a careful observation, or a safe comparison can be a beginning.
Keep an investigation simple. Watch a plant over several days, compare the shapes around your home, or notice where sunlight falls at different times. Talk about what changed and what stayed the same.
Make space for an answer to change. Learning includes revising an idea when new evidence appears. Encourage your child to explain their thinking and enjoy the process of discovering something together.