My 3 month old baby spits up milk even after burping. She spits up a lot (as milk form or curd form) when I lay her on my lap and pat her back. When she lies on the shoulder it is comparatively less. When I lay her on bed after hearing two burps she spits in between. sometimes a little and sometimes a lot. She is breastfed and doesn't hesitate to drink till now. Is this kind of spit up normal?