Session times are minimum scan times. We understand sometimes baby can be Shy, which is why we book our sessions with lots of cushion in between. We will work with you and baby to make sure we see the gender clearly & make sure you're comfortable in the process. Our Genders are guaranteed or your money back. There are other techniques to get it at 13 or even 12 weeks but I’ve found them to be unreliable. I don’t want to guess with something as important as gender. Our track record and reviews speak for themselves. We call gender consistently and reliably at 14 weeks. If baby doesn't cooperate or we can't call it confidently, we'll have you back for a free rescan.