小骆驼莫扎和他的爸爸妈妈还有朋友们生活在一片沙漠边的草地上，他觉得自己每天有朋友们一起玩，有爸爸妈妈陪伴，是最开心和幸福的。很快，莫扎希望有个弟弟或妹妹的心愿实现了，他有了一个可爱的妹妹！但同时，莫扎从初做哥哥的兴奋中尝到了失落的滋味。故事在此处推向高潮，莫扎由于妹妹弄坏了自己的玩具反倒被妈妈批评"没有收好自己的东西"时独自走向沙漠，而可爱的妹妹却一路跟着来了。
书中的小骆驼从希望有个兄弟姐妹来陪伴，到成为哥哥的开心与兴奋，以及转变为担心父母只爱妹妹的失落之情，是一个还没长大的孩子成为兄长的真实情感过程。同时也能在莫扎带着妹妹安全回到家，主题曲《什么东西多？》中体会到当哥哥的责任与成就感。
整个故事音频中，加了多妙原创的3首歌曲和3支念谣。大家在听完故事后，还可以分别单独感受这些歌曲及念谣，在说与唱的时候，宝宝会不会也想和妈妈要一个小弟弟或小妹妹呢？
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