16month old sleep issues

[cloboe]

My son has never been great at sleeping, not so long ago, I could put him to sleep at 8 then only be awake at 4 but have to co sleep from then on.
Recently after a recent temp illness, he's fighting his naps, waking up regularly after I've put him down, sleeping 3-4 hours when waking up. He's not self settling at all. Any advice? Will this pass again? I feel I'm doing things wrong as sleep is still an issue.

My DD just turned 17 months and we have had a few weeks of awful sleep. She would either take absolutely ages (hours!) to go off to sleep or be up for hours in the middle of the night. It seemed to happen regardless of how long she’d napped for in the day. We seem to have turned a corner the last few days and she actually even slept through last night. She has finally mastered walking so unsure if that was causing it or if it was separation anxiety because she would be inconsolable every time we put her in the cot. But it will pass!