DD is 2.5 yrs. DS is three weeks old today.
DD is getting progressively worse with sooking and crying and whinging if she doesn't get her own way, if we tell her no, if we ask her to do something (even the most simple stuff). Everything becomes the biggest challenge imaginable. Shes also regressing slightly with TT and having wee accidents a lot (they were a rare occurenve prior to this).
I know that this is normal for her age, and probably expected to be worse given DS's arrival. But I am experiencing severe sleep deprivation (DS has suspected silent reflux and barely sleeps and is unsettled a lot) and I'm honestly at the end of my patience.

Can anyone advise their secret tips for dealing with this before I go insane??