Arabic hadith text
وَحَدَّثَنِي عَنْ مَالِكٍ، عَنْ نَافِعٍ، أَنَّ عَبْدَ اللَّهِ بْنَ عُمَرَ، كَانَ يَقُولُ إِذَا نُتِجَتِ النَّاقَةُ فَلْيُحْمَلْ وَلَدُهَا حَتَّى يُنْحَرَ مَعَهَا فَإِنْ لَمْ يُوجَدْ لَهُ مَحْمَلٌ حُمِلَ عَلَى أُمِّهِ حَتَّى يُنْحَرَ مَعَهَا ‏.‏
Translation

Yahya related to me from Malik from Nafi that Abdullah ibn Umarused to say, "If a she-camel that is being driven as a sacrificialanimal gives birth, the offspring should be carried along as well andthey are sacrificed together with her, and if there is no place wherethey can be carried, they should be carried on the mother until theyare all sacrificed."