This would be a great opportunity to communicate with the student's parents/family and discuss your observations. This could be a health issue or simply a cultural difference.

especially for young students, sometimes they are not conscious enough of everyone's personal space. Is this an ELL student? maybe the student is trying hard to concentrate in what you are saying.

This student may be from a different culture. Sometimes, cultural differences are hard to understand in a classroom. The student may also just have difficulties understanding personal space, boundaries, or have difficulty with depth perception. The teacher could contact the family to see if these are reoccurring issues at home and what they do to help the student feel more comfortable. Then, based on what the family says, the teacher and the family could work together to come up with a solution in the classroom.

Try getting to know the student better. They may be from a different culture where staring can be a sign of respect.

I would have a conversation with the student about their behavior, and see if there might be a reason behind it. I would also make sure that you have set clear boundaries and classroom expectations, and explain this to the student, and if need be the parents.

Ask the student on the side if everything is ok and if they need any help. Ask the student if they can hear you ok or if their head/ear hurts at any moment.

TAlk to parents

I would have a conversation with the student to make sure everything is okay with the student.

Email or call the parent to learn more about the student. Talk about how the student is doing in class, such as highlights from particular lessons. Make it a comfortable conversation. Then bring up the concern, but not in a negative way.

I think it's important to first have a discussion with the parents to see if this is something that happens at home as well and then to talk with other teachers to see if they have the same situation and how they deal with it. The student may not be aware of what they're doing. I would also sit down with the student to try and assess where they are emotionally and intellectually.

I would ask the student why they keep bumping into me. Commnication should always be the first step when interacting with any person. From there I would see if it's a medical situation or maybe nerves of being new.

definitely communicate with the family is this continues.