No I made a conscious effort right from birth to try and prevent continual frequent night wakings. It wasn't luck, if it was luck I would have just fed when they cried and let them sleep when they wanted for as long as they wanted, e.g hours without feeding in the day and then wondered why they were awake all night etc.
With subsequent children it can work both ways, some people have more time for the first to focus on them all day and then they may sleep better at night, whereas siblings then get less time, so it is made up for at night in the early days which sets a pattern. Less energy from the parents as there is more to do with more children may mean they just go with the flow more, when actually a little more structure would help even if it is harder to start with it quickly pays off.
For others though more experience helps with more children, and the tendency to sleep late in the morning isn't possible if you have a school run to do, so a better routine is created from the start through circumstance.
Whatever the situation of first or subsequent children, a baby and toddler, or babies and school age children, yes I still believe that a routine tailored to fit in with all the children can usually work, and I don't mean that in the sense of 'only feed every x hours, and sleep from x to x exactly'. I mean an idea for the day of total sleep, number of feeds, not too tired for a good feed at 6/7pm, put to bed then, woken well for a feed at 10/11pm, setting a pattern, guiding the baby. If the baby falls asleep very quickly, particularly in the evening and in the night, rouse a little and feed some more until you think they have had a really good feed, if you don't yes they will be awake again in an hour wanting feeding again.
A good daytime sleep in their cot, as well as the out and about ones, gets them used to sleeping where they will be at night. You can deal with helping them to learn to self settle much better in the day than at night.
Feeding when doing stuff with the other children, reading homework etc. I do my DDs hair for school while breastfeeding for example.