Although complications are extremely rare, I will always talk through potential risks of the procedure before taking consent, and will discuss ways to minimise these risks.
There are often a few drops of blood collecting under the tongue after the release. This generally stops very quickly with feeding. Very occasionally, some babies may need a few minutes of pressure applied under the tongue if bleeding is not stopping with feeding. Heavy bleeding is a recognised risk, although this is extremely rare.
Cases of infection are extremely rare (especially if giving breast milk as this has many protective factors), but it is good practice after the procedure to ensure that any bottles, dummies etc. are sterilised before use, and that infant formula is prepared safely (as per instructions on the tin) to ensure that there is no bacterial contamination.
Reattachment is uncommon but can occur, although not all babies with some reattachment will require a second division. I will show you some very gentle exercises to encourage tongue mobility and reduce this risk.