It is narrated from Maymunah (may Allah be pleased with her) that she said: When the Prophet (ﷺ) performed prostration, due to his sides being separated from his body, if a small (goat or sheep) kid wanted to pass underneath him, it could pass.
Hadith Referenceمسند الإمام الشافعي / كتاب الصلاة / 248
Hadith Takhrijاخرجه مسلم الصلاة، باب الاعتدال في السجود و وضع الكفين على الأرض.... الخ : 496