您好，我觉得4岁的宝宝，可以委婉的告知他（她）是怎么来的，是因为爸爸妈妈相爱，才有的你，等你长大了，也会有自己的宝宝，有的事情等你长大了，就会明白了。

{!-- PGC_VIDEO:{"thumb_height": 864, "vposter": "http://p0.pstatp.com/origin/tos-cn-p-0000/0a79038b9cbc44fd9046ee9adf765300", "thumb_width": 1536, "vid": "v02016930000bpccrdt7gl1gq970q3h0", "vu": "v02016930000bpccrdt7gl1gq970q3h0", "duration": 31.88, "thumb_url": "tos-cn-p-0000/0a79038b9cbc44fd9046ee9adf765300", "thumb_uri": "tos-cn-p-0000/0a79038b9cbc44fd9046ee9adf765300", "video_size": {"high": {"duration": 31.88, "h": 864, "w": 1536}, "ultra": {"duration": 31.88, "h": 864, "w": 1536}, "normal": {"duration": 31.88, "h": 864, "w": 1536}}} --}