Does touching a child's clothes wet with urine invalidate the ablution?

Q: This is a message we received from a listener: S.M. from Jeddah. She says: There are many things that happen daily, and I do not know whether they invalidate the ablution or not? I will list them in points, and I hope you will clarify which of them invalidate the ablution and which do not. For example: touching the sanitary fixtures in the restrooms, also standing barefoot on the tiles of the restrooms, touching a child's clothes wet with urine, touching or kissing one's husband, eating or drinking immediately after ablution and before prayer.

A: 1- Touching the sanitary fixtures and the bathroom tiles barefoot, none of this invalidates the ablution. However, if there is ritual impurity on the tiles and the woman or man steps on it, this does not invalidate the ablution, but each of them must wash their foot if they stepped on it while it was wet, or if there is moisture on their foot.
2- Touching a child's clothes wet with urine does not invalidate the ablution, but whoever touches them while they are wet must wash their hand. Likewise, if the clothes are dry and their hand is wet, they must wash their hand.
3- Touching or kissing one's husband does not invalidate the ablution according to the most correct opinion of the scholars. Likewise, his touching her does not invalidate his ablution, whether that is with desire or without it, as long as nothing is emitted from the semen or pre-seminal fluid, except if one of them touches the private part of the other, in which case the ablution is invalidated by that.
As for His saying, the Exalted: [Al-Ma'idah: 6], the intended meaning by that is: intercourse, according to the most correct opinion of the scholars of exegesis, as stated by Ibn Abbas (may Allah be pleased with him and his father) and a large group of the people of knowledge.
It is authentic from the Messenger of Allah (peace and blessings be upon him) that he kissed some of his wives and then prayed without performing ablution. However, if something is emitted from the pre-seminal fluid, it is obligatory for the one from whom the pre-seminal fluid was emitted to perform ablution for prayer and the like, after washing the private parts and the two sides, and after the woman washes her private part. As for if what is emitted is semen, it is obligatory for the one from whom it was emitted to perform the full ritual bath.
4- Eating or drinking immediately after ablution and before prayer does not invalidate the ablution, and there is no blame in it, except if the food eaten is from camel meat, in which case the ablution is invalidated by that.
As for sheep meat, cow meat, game meat, and other permissible meats, the ablution is not invalidated by them. Rather, it is specifically camel meat that invalidates the ablution; due to the saying of the Prophet (peace and blessings be upon him): And a questioner asked him, saying: O Messenger of Allah, do I perform ablution from sheep meat? He said: Then he said: Do I perform ablution from camel meat? He said: Narrated by Muslim in the Sahih.
5- Touching strangers after ablution, this requires detail, for it is not permissible for a woman to touch a strange man or anyone else, if he is not one of her mahrams. However, if she touches him by touching his hand or his foot, the ablution is not invalidated by that. Likewise, if she touches her brother's hand or her father's hand, or her uncle's hand, or kisses his head, or kisses his nose or the like of that, the ablution is not invalidated by that, as mentioned previously.
As for the stranger who is not a mahram for her, she does not touch his hand, nor does she shake hands with him, nor does she touch any part of his body, and he does not touch her. She only greets him with words without touching: How are you, so-and-so? And upon you be peace, and peace be upon you, how are your children? How is your family? And the like of this, without shaking hands, and without uncovering, and without touching. Rather, she veils herself from him in her face, hair, and body, and greets him with words only, as mentioned previously.
6- As for the caressing of the husband, it is good and prescribed. It is prescribed for her to caress her husband and for him to caress her, and this is from the Sunnah of the Messenger (peace and blessings be upon him) with his wives. He used to caress them, may Allah's prayers and blessings be upon him, and the ablution is not invalidated by that if the caressing is like kissing.