... and make them take DD2 for at least an afternoon 
DD1 has always been fairly intense - but more verbally, than anything else (early talker, insatiable curiosity, stream of consciousness chatter) although it's combined with the energy of an over exciteable puppy. She's great fun, but hard work.
When I was pg with DD2, I used to joke that another one like DD1 (then 4) would send me batty (I'm an introvert with not huge amounts of tolerance for silliness). I was assured that the second was easier.
Even if we ignore the allergy issues & connected worry (for us) and lack of sleep (for her & by extension us)... They lied. All of them.
Today (a relatively good day) DD2 (now 22 months) has: climbed or balanced on: sofa back, high chair, two toddler bikes, kitchen gate, shelves (in an attempt to get biscuits) and dining table. She has also stolen my glasses and run off cackling, kicked me repeatedly when I tried to change her nappy,,and hidden under a blanket shouting "gone".
In the car she managed to get one arm out of the harness and pull at the door level (thankfully child locked).
She has also given me sloppy kisses. "Put me to bed" when I was sitting on the couch, giggled at my singing, blown raspberries at me, and produced her first 4 word sentence (more pear mummy, yum 
)
She will turn me grey before she turns two. She's many things: Houdini, comedian, acrobat, minx,trouble.... but one thing she isn't is easier.
ten minutes and counting til bedtime