Oh, I totally understand the exhaustion, we went through such a rough patch with our second when she hit the four-month regression, and I genuinely wish we had reached out to a sleep trainer sooner instead of just muddling through on our own! From what I've heard around, two names that come up quite often are Evelyn Bonney (she's actually a nurse with over 20 years of experience, which gave me a lot of confidence) and the duo Lavinia and Adeline, who are certified consultants and have worked with over 1,200 families, newborns all the way up to nine-year-olds. Evelyn's packages are generally in the SGD 995 to 1,695 range, and Lavinia and Adeline offer a free 20-minute call first, which is a nice low-pressure way to see if they're the right fit before committing. One thing I'd gently flag is that Singapore does have some very good consultants but also a few who take a one-size-fits-all approach, so it's worth asking upfront how they tailor their method to your child's temperament and your family's comfort level. Do hope you find someone who really listens and makes this whole journey a little easier for your family, hang in there, you're doing great!