How to stop toddler sims going out the front door randomly?

I have 3 toddler sims in my town and they keep going out the front door of the house they are in and it really bothers me because I give them an enclosed yard space so they would be safe (if real life) but they always seem to go out the front door rather than in the yard…
I made a daycare/house with a yard for when the mum and dads when to work because I had someone living in the bigger house (tompsons which had one toddler at the time) that didn't have a job so the toby (the other toddler at the time) would go there while his parents were at work then back to his house when they got home but I wanted the tompsons to have another kid and you can only have 4 people in the house so I built her a house and made it a daycare centre at the front but couldn't afford a riverside estate or whatever they are called at the time so I didn't have much room and it only has a small enclosed yard between some of the rooms could that be why? I am saving up for a riverside because they are like twice the size so I can still have her house and the daycare with a bigger yard, will that solve it?
Sometimes I just take the door off but that bothers me so much cause it's hard and time consuming putting it on and taking it off every time the kids are there and it's needed…
They seen to like going around the front and side of the house.
The adults do it sometimes as well but that doesn't bother me as much please give me suggestions!
Added (1). Sorry I forgot to add I have Sims Freeplay on iPad

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