No no no no no no.
Don't read that shash about how children should be sleeping through the night.
They don't. And before someone comes on here and says "Oh mine slept right through the night by the time they were 3 months", its not usual. You were very lucky 😂
It is normal for babies to wake many times. Its normal for toddlers to wake many times. Its normal for them to wake more during development leaps, growth spurts, teething, upset stomachs, illness, immunisations, anxiety, bad dreams, changes in the house. And a whole myriad of other things.
My first born still does not sleep through the night. He's 3. But he will eventually.
My second born (currently napping on me) is 5 weeks old. She sleeps very well. Wakes fully maybe once a night.
Co-sleeping saved my sanity with DS. He refused to sleep on his own. He refused to sleep in his moses basket. I caved and tried sleep training. Worst 6 weeks of my life - just made everyone miserable.
I highly recommend reading Sarah Ockwell Smith's Gentle Sleep book. Totally non judgmental. Very gentle approach. She explains the sleep of infants and things you can try to get them to sleep longer. She is my go-to for all things child related.
I wish you all the luck in the world for finding something that works for you. For us, it was white noise and co-sleeping.