Baby wakes up crying a lot

Dee

My baby has been waking up in her sleep since she was like 3 months old where she will go to sleep but wake up screaming or crying during the sleep I have to go in her room many times to calm her or put her back to sleep lay next to her ( in our bed ) she is now 6 months and it’s hard for her to stay asleep she wakes up many times and my husband thinks it’s sleep apnea or terrors . Any ideas of what this could be ? I feel so bad for her it happens during day naps and night time too