Hi there - There is an 18 month age gap between my older girls, and then a 4 year gap to my youngest. At this stage in our lives it is fantastic. The older girls love Hannah and are fantastic with her. I worry how things will be in the future - especially as I haven't ever put the girls into daycare - and haven't thought of doing it with Hannah. Yet. I know that i can take her to playgroups and other activities to stimulate her mind and for her to socialise. I guess i'll just take it as it comes. I do wish we could have had another - just so that Hannah had a playmate as well.