Most time this kind of feelings of closeness is not reciprocal or not being felt by both parties. There's a mismatch of caring, for example, mother's love and care is usually not matched with children's love towards her. When your son turns into a teenager, you'll feel that the gap is widening. Your son will seek more independence and he will be less attached to you. Then there'll be disappointment and pain from your part. So the best tactic is do not expect the same feelings coming from the person you care the most. People might change over time,
especially children. The more you expect from them, the more likely you will feel
being left out in their life. One day,the used-to-be kids would be fully grown and no longer cuddle around you. And that's bound to happen.