Yes, my kids went to childcare at 20mths, 18mths and 10mths respectively... usually after I go back to work.
For me, I sent them to childcare to lighten my MIL's load. Yes, the children will fall sick more, but to me, it's a way to build up their immune system, so that by the time they are in proper school, their immunity is built up and they have more resistance. Also stay at home, MIL only let them watch a lot of TV and eat snacks... so...
My youngest still in childcare because I want to focus on my P1 and K2 homework... if she at home, she won't sleep because siblings around, and older two can't concentrate on homework also. Plus I do the school run, so she will be in the car a lot of the time... then still have to cook and clean... no time to stimulate her. So decided to keep her in childcare so that she can learn and interact with other children.
I think they get to be very independent when they go childcare... learn to feed themselves, learn to put on clothes... and the upside? school toilet train for you!!! heh.
My kids all only come out of childcare when go nursery... actually wanted to let her stay childcare another year next year... but bethesda say if want to wait until K1 then get in, sure no space, so bo bian, have to put in N2. So next year she will be out of childcare and in 3hr N2 class.
But if your baby comes very close to time when gal is going to childcare, you probably want to consider sending her in one or two months before, so that she won't associate with baby's arrival.
My son went to childcare 4 mths after sister was born, as that was just before I went back to work. Later, when sister's turn to go in, he left and went to Nursery. baby went to infantcare, then at 18mths, shift to a childcare near my place. Luckily the childcare got taken over by carpe diem... wah, "tan dio"... because they got pricing guarantee... so I pay only $300+ a month for carpe diem. heh. then got free uniform some more... buy 1 get 1 free.
so to me, i will say go for it lor... at lesat you don't have to worry about juggling baby and the older one, and also don't have to worry about neglecting her and not stimulating her enough because of baby. Some more, can use baby's baby bonus to pay. why not?