First, from a Buddhist point of view, if you give birth to a child, you are creating the occasion for another sentient being to begin yet another cycle of birth and death. On the other hand, if you do not give birth to this child, the sentient being will still be born through other causes and conditions, because it has the karma to be born again.

If you do not have children, it might be because you cannot, or because it simply does not happen. Perhaps you take certain precautions ─ using birth control, or in the extreme case, abortion. If you use birth control to avoid having children because of your desire to practice, the question of intention arises. If it is because you truly want to spend most of your time practicing, and you are not desirous of having a family, then that is quite alright. However, if you say "I don't like kids. They'll interfere with my practice, " that attitude is self-centered and wrong.

The first attitude is that you are spending most of your time practicing and has nothing to do with grasping or avoiding. The second attitude implies a feeling of aversion toward children, with the thought that they will interrupt your practice. The second attitude is incorrect.

There is also a realistic question. If you do not have any children, does it really mean that your practice will be better? And if you do have children, does it mean that your practice will be distracted? If you don't have children, you may spend your time doing other things anyway. On the other hand, if you do have children, you will have to cut out many other interests to care for your family, and you end up with more time to practice.