My daughter’s reflex is mostly gone but she’ll occasionally startle when I place her down in the bassinet (4 months old). I found that a transition swaddle such as the Halo Swaddle Sleep Sack while keeping arms free helps a ton!
Swaddling is preventing the reflex from integrating. I know it’s hard, but transitioning out of the swaddle will help it integrate.
@Leah have you used the sack or do you still swaddle her? does your baby sleep through the night?
By making her startle more during the day, you’ll help her integrate that reflex and she’ll be able to sleep better at night.
My son still does and he is 4 months.