The Messenger of Allah ﷺ forbade qaza (shaving part of a child's head while leaving other parts unshaven).
حدثنا أبو جعفر المدائني أخبرنا مبارك بن فضالة عن عبد الله بن دينار
نهى رسول الله ﷺ عن القزع
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Its chain of transmission is daif, due to a break in it, but the hadith itself is sahih and well established, as we shall explain.Abu Jafar Madaini is Muhammad bin Jafar Razi, the cloth merchant, one of the teachers of Ahmad, and he is reliable. In Tahzeeb it is stated that Mahna reported from Ahmad, "There is no harm in him," and Ajurri said likewise on the authority of Abu Dawud. Abu Hatim said, "His hadith is written down but not relied upon." Aqeeli said in Duafa, "Ibn Hanbal said, that is the one from Madain, Muhammad bin Jafar, I heard from him, but I have not seen anyone narrate from him before, nor will I ever narrate anything from him." This is what Aqeeli said, as quoted from him in Mizan and Tahzeeb, but it is certainly a mistake, for Ahmad did narrate from him and reported from him frequently in the Musnad, including this very hadith, as well as what will come at 8698-8702, 13331, 14845, and 15314.We have judged him reliable because Bukhari included a biographical entry for him in Kabir (1/1/58) without mentioning any criticism of him, and neither Bukhari nor Nasai listed him among the daif narrators. Ibn Hibban listed him among the trustworthy narrators, and Muslim included a hadith from him in his Sahih (1:214) from the narration of Jabir bin Abdullah, which is one of the hadiths in which Ahmad's narration from him is noted at 14845.As for Mubarak bin Fadala, his reliability was established earlier, along with the fact that he practices tadlis, at 1426. This hadith is one in which he concealed a defect in its chain, as shown by the following chain, which mentions that he narrates it from Ubaydullah bin Umar from Abdullah bin Dinar. So he concealed this here and omitted Ubaydullah bin Umar. Bukhari gave a biographical entry for Mubarak in Kabir (4/1/426) and mentioned that he heard from Ubaydullah bin Umar.The hadith itself is sahih, having appeared many times before with sahih chains, including at 5551 through the narration of Warqa from Ibn Dinar, and see also 5846.