Volume 2, Book 22, Number 313:

Narrated Abu Huraira,

Allah's Apostle said, "When the Adhan for the prayer is pronounced, then Satan takes to his heels passing wind so that he may not hear the Adhan and when the Muadh-dhin finishes, he comes back; and when the Iqama is pronounced he again takes to his heels and when it is finished, he again comes back and continues reminding the praying person of things that he used not to remember when not in prayer till he forgets how much he has prayed." Abu Salama bin 'Abdur-Rahman said, "If anyone of you has such a thing (forgetting the number of Rakat he has prayed) he should perform two prostrations of Sahu (i.e. forgetfulness) while sitting." Abu Salama narrates this from Abu Huraira.

Volume 1, Book 4, Number 223:
Narrated Um Qais bint Mihsin:

I brought my young son, who had not started eating (ordinary food) to Allah's Apostle who took him and made him sit in his lap. The child urinated on the garment of the Prophet, so he asked for water and poured it over the soiled (area) and did not wash it