Anyway it is just a single hadith whereas the Quran has been transmitted in a lot of ways, so it is probably just an erroneous hadith and doesn't pose a serious challenge to the authenticity of the Qur'an.
Besides, if someone was going to intentionally lose a part of the Qur'an, one would think it would be about a more controversial subject than how many times a baby should be suckled to be mahram. And it is unlikely that it would be lost accidentally.
Shia believe that Quranic text is intact and no one can change it as Allah (SWT) promised in Quran (We Have revealed the Thikr (Quran) and We Are keeping it intact) Sura 15, Verse 9.
Uthman removed he Tafseer which was mentioned by the Prophet Muhammad (SAWA) on some verses and written by Imam Ali (AS). The Quranic text remains the same.
Our Shia faith in Quran is: Quran is absolutely intact and saved by Allah The Glorious from any change, distortion or alteration. Narrations which suggest change or distortion in Quran are mainly in Sunni books including narrations from Umar Ibn Al-Khattab who claimed that Sura Al-Ahzab used to be as long as Sura al-Baqara. (al-Soyooto, Al-Dorr al-Manthour 3:208) and Ayisha who claimed that a Sura was eaten by a pet (Sunan Ibn Maajah 1:625).
Few narrations in this regard came from Sunni books to some of our Shia books but our leading scholars were and are always very clear in rejecting any claim against the fact that Quran is intact. Some narrations in our books might mean that people distorted the meaning (Tafseer) of some verses away from the real meaning explained by the Prophet (SAWA) and his Ahlul Bayt (AS) which is a sad fact, but it never means that Quranic text was distorted by any way.
Leading Shia scholars al-Shaikh Al-Saqouq (381 H), al- Shaikh al-Mofeed (413 H), al-Sayyed al-Mortadha (436H), al-Shaikh al-Toosi (460 H), al-Shaikh al-Tabrasi (548H), al-Shaikh al-Bahaa'ee, al-Faydh al-Kashaani, al-Shaikh Kashif al-Ghitaa', al-Sayyed Sharaf al-Deen, Allamah Tabataba'ee, al-Sayyed al-Kho'ee, al-Sayed al-Khomaini, al-Sayyed al-Gulpaygani, al-Sayyed al-Borojordi, al-Shaykh al-Saafi, al-Sayyed al-Sistani, al-Sayyed al-Hakeem and all our leading scholars are very clear in confirming the fact that Quran is absolutely intact from any change or distortion.
It is the consensus of the Shi'a scholars that there is no distortion in the Qur'an. You can read more about this topic in the article below that gives references to the statements of a variety of scholars.
A famous scholar Ayatullah Sayyid Abu'l Qasim al-Khu'i has a detailed discussion around this topic in his book that you can also go through for a more in-depth treatment of this subject.
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