Do the one performing Hajj alone and the one combining Hajj and 'Umrah perform tawaf and sa'y?
Machine translationRead the Arabic original
The questioner : Yes.
The Shaykh : The one performing Hajj alone and the one combining them perform tawaf and sa'y, just as the Messenger (peace and blessings be upon him) did, but he remains in the state of ihram until he is released from it.
The questioner : Do they perform sa'y on behalf of children who have not yet performed Hajj?
The Shaykh : No, the tawaf of Hajj is not sufficient, because this is called the tawaf of arrival, which is a recommended practice. The sa'y is sufficient for them, for the Messenger (peace and blessings be upon him) did not perform sa'y a second time after he had performed it at the beginning, but he did perform tawaf.
The Shaykh : The one performing Hajj alone and the one combining them perform tawaf and sa'y, just as the Messenger (peace and blessings be upon him) did, but he remains in the state of ihram until he is released from it.
The questioner : Do they perform sa'y on behalf of children who have not yet performed Hajj?
The Shaykh : No, the tawaf of Hajj is not sufficient, because this is called the tawaf of arrival, which is a recommended practice. The sa'y is sufficient for them, for the Messenger (peace and blessings be upon him) did not perform sa'y a second time after he had performed it at the beginning, but he did perform tawaf.
Source
قناة «فضيلة الشيخ محمد بن صالح العثيمين»، 77 - هل المفرد والقارن يطوفون ويسعون؟ مناسك الحج والعمرة - ابن عثيمين — youtube.com
The Arabic text is a machine transcription of the audio recording.