Sleeping through the night consistently?

Ma

So my LO is 13 months and is a pretty good night sleeper. She’ll usually sleep through the night but it’s never consistent. Like she’ll sleep through the night for like a week and then be waking up again. Is that normal? She’s not sick and not teething. When will she just sleep through the night for a longer span than a week? I hate going to sleep every night thinking about if she’ll be awake screaming for us.