Bedieved if circumcised prior to 8th day:[1]

Some Poskim[2] rule that if the child was circumcised during the daytime prior to the eighth day then Bedieved he fulfills his obligation. Nevertheless, Hatafas Dam Bris must be repeated after the morning of the eighth day.[3] [Some Poskim[4] rule that in truth, according to this opinion, even Hatafas Dam Bris is not required to be performed as Bedieved one does fulfill his obligation with a pre eighth day circumcision. Accordingly, the Hatafas Dam Bris may not be done on Shabbos and a blessing may not be recited over it. However, other Poskim[5] rule that one does not fulfill his obligation with a prior to eighth day circumcision, and hence the Hatafas Dam Bris is required [although even in his opinion, may not be done on Shabbos[6]].[7] Practically, one is to suspect for both opinions, and hence although the Hatafas Dam Bris must be performed, nonetheless it is not to be done on Shabbos, and is not to be performed with a blessing.[8]]

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[1] See Rama Y.D. 262:1; Pesakim Uteshuvos 262:8 footnotes 49-50; See Encyclopedia Talmudit Vol. 46 Erech Mila p. 486-488, 491-492

[2] Rama Y.D. 262:1

[3] Shach 262:2; Taz 262:2

Other opinions: Some Poskim rule that Hatafas Dam Bris is never required as it does not accomplish anything, as what was done was done. [Shaagas Aryeh 52; See Pesakim Uteshuvos 262:8 footnotes 53]

[4] Taz 262:2 in understanding of Rama ibid; See Pesakim Uteshuvos 262:8 footnotes 51

[5] Shach 262:2; Taz 262:2; Shaagas Aryeh 52; See Pesakim Uteshuvos 262:8 footnotes 52

[6] Shach ibid; Beir Heiytiv 262:1

[7] Shach ibid [from the letter of the law] Taz ibid [as a stringency]

Other opinions: Some Poskim rule that Hatafas Dam Bris is never required as it does not accomplish anything, as what was done was done. [Shaagas Aryeh 52; See Pesakim Uteshuvos 262:8 footnotes 53]

[8] Bach 262; Chochmas Adam 149:2; Aruch Hashulchan 262:5; Pesakim Uteshuvos 262:8 footnotes 54