I am! My girls are 14 months now and I've been a Leader for 2 yrs. I find (and I found the same thing with my now 4 yr old) that this is the age where it gets tricky to lead meetings with them there. I'm going to try and just take one of them if I'm leading (I have co-Leaders so it's not always me leading). I also have a plan in advance and make sure my co-Leaders know about it so they can jump in if necessary - luckily, it hasn't been. Mostly I just find myself leading while walking around chasing my girls. Our meeting space is very baby-friendly but it's still a challenge
For phone calls, I have a few strategies. For my designated phone days (we pick up messages from a central voice mail), I get dh to help or wait until evening to return my calls. For random calls, I play it be ear. Sometimes I can take the call right then, other times, I ask if I can call them back - depends on what my kids are up to and how desperate the mom sounds!
For other LLL stuff, I also play it by ear. I don't go to Chapter meetings because they're in the evenings but I am volunteering for our upcoming conference because I'm doing publicity and that can be done from home. I'm also an ACLA and do that work whenever I can fit it in!
It can be tough but I think it's worth it. My co-Leaders and I also often remind each other that LLL is "family first" and that we don't need to apologize if something comes up last minute that we need to take care of with our family and we cover for each other on a regular basis. I think it also helps that in our Group we have Leaders with different ages of kids. Myself and another co-Leader both have young twins. She can't do evenings (when our Series Meetings are) so she hosts the enrichment meetings and often leads those. Our other co-Leader has older children so she goes to the Chapter meetings and represents our Group there.
We also are working on having some Group moms take over the Library and Treasury so we don't have to worry about those at meetings.