Any mothers of both an infant AND a toddler out there?

I was blessed with 2 children within 16 months of each other. I am calling it a blessing but lets be honest this blessing also comes with plenty of fears and frustrations as well.
My 16 month old was able to stay in her preschool class for the first month of my son's birth to help with my recovery from the c-section. However today is her last day (and also the last day of my career as a preschool teacher myself for the timebeing).
Does anyoneone have suggestions about how to fill the older child's day with enriching age appropriate activities while still taking the best care possible of the younger one?
I am so torn as I truly want the best for both kids but just don't know how to morph into two people and give it to them.

Thank you for your help!

i have 2 kids my DD is 15 months old and my son turned 2 in july  
and well itry doing some activies for both of them and sometimes it goes well and somtimes not...

It's hard. Really hard.

For me, anyhow.

My guys are 20 months apart. I try to engage Jack in something that is easily managed [or at least easily cleaned up!] if Basil is fussing and needs extra attention. He loved fingerpainting today. The fingerpaint we have wipes up easy and doesn't stain and it's non-toxic, of course, so I didn't have to jump into action when he stuck his paint-covered finger up his nose.  

my kids are exactly 15 month apart just turned 5 and 20 months on the 23rd and my oldest is a little behind having to go to speech and sensory therapy but so i do alot of that stuff and play with them. Sit my 5 month old next to me and play with both she is amazed by my 20 month old...read to them let them try to play together

My girls are 3 weeks and 20months and I'm struggling with time especially with breastfeeding the baby. Isla is craving my attention and has started playing up to get it. Its heartbreaking she wants to sit on me all the time now and she clings to my legs and wants to be carried everywhere. I don't know how to get that one balance  
This is so knew to me because my oldest and middle child are 4 years apart. That was a great gap, this gap is much harder

I have a 4 yr. and a 3 yr.(14 1/2 months apart) and a 11 month old and 2 1/2 week old!I usually have the 11 month in the highchair when the older 2 are at the table doing crafts, coloring, play-doh etc. When my older 2 were younger and the littlest one wasn't mobile yet, I would either put her in the swing or on the floor with us while we played toys!It does get very difficult with having them close in age but you do what you can and don't stress yourself out!Always remember they are still young and don't remember how much time you spent with them as long as you still spend time.My kids are very independent and have learned to play well by themselves and with each other(sometimes)