No, I don't think "no sibling guilt" is a good enough reason to have a second child. If you and your family are happy as is, and if you think it might put strains on you to have another, then I think that says it all. Your DS will be fine as an only sibiling. You might need to be mindful of giving him adequate contact with friends, cousins ect. but other than that, he will be happy because you are! I don't think people should feel pressured to have more than one child for the child's sake. The child will grow up best if their parents are happy/content with their lives and this may not be the case if a second child is added but not particularly wanted. You need to look after your own interests to protect the interests of your DS. GL!