Nipple stimulation to induce labour is something a few mums in my group have tried around 38, 39 weeks, some said it did bring on mild contractions, especially when they did it consistently for about 15, 20 minutes per side, while others found it took a few days before anything really happened. The Haakaa is a popular option because it creates gentle suction without you having to sit there manually expressing the whole time, though someone in my mum group mentioned that hand expressing with massage around the base of the breast can feel more controlled if you want to pace yourself. That said, the key trade-off is consistency versus comfort, electric pumps are more efficient but can feel too intense early on, whereas the Haakaa is softer and easier to manage. One thing worth knowing is that this is generally considered okay from 37, 38 weeks with a straightforward pregnancy, but if your situation changes at all, it's definitely worth a quick check with your gynae or midwife first before trying.