One good way to meet other mothers is to go to your
condo's playground or pool on a Sunday because maids often have Sundays off, so the parents are outside with their kids.
Another option would be to see if there's a Croatian association in Singapore. There is an Italian one:
http://www.iwgsingapore.org I know that Italy isn't Croatia, but it's in the same region.
I've used meetup.com and still visit the site from time to time. It can definitely be a good resource for parents (free to join) but the only downside is that many of the "meet ups" cost money and it seems businesses use the site for advertising purposes.
Most of the meet ups for babies and toddlers are classes or sessions at indoor playgrounds, costing $10-$50 per event. Nothing wrong with that, but they can add up very quickly and they're often "trial by fire." For example, if your kid doesn't like to sit in a circle with others, he/she won't get anything out of the classes and you'll feel like you're wasting money. I've taken my child to music classes and he usually tries to leave the room or rearrange the chairs or cushions on the couch in the corner of the room. However, if your child doesn't mind sitting and listening, a music class might be perfect.
Indoor playgrounds can be nice, but it depends on the playground. Some are wonderful, but not all are "safe" and some are pricey.
Sometimes free meet ups are at parks, which is ok, but it really depends on your kid. If he/she likes to run off and do their own thing, you won't be able to talk to other parents because you'll be chasing your child around concerned you'll lose them because parks here aren't fenced.
I like the meet ups at people's homes, where the kids can just play with toys and the parents can sit on the couch (or floor) and talk. I've tried to host free meet ups at my place, but the way some of the groups on the sites are set up makes it impossible to get the meet up into a high-profile place on the site, so nobody sees it.