Question 1

What is object permanence and when does it develop?

Accepted Answer

**Object permanence** is understanding that things continue to exist when you cannot see them. It sounds trivial and is a genuine cognitive achievement — a young infant appears to treat a hidden object as though it has ceased to exist.

**Piaget's classic demonstration.** Show a baby a toy, then cover it with a cloth while they watch. Before roughly eight months, many infants simply stop searching, as though the toy is gone. After that age they will lift the cloth to retrieve it.

Piaget described this as developing across the sensorimotor stage, becoming reasonably established around **8 to 12 months** and refined through the second year.

**Later research substantially revised the timeline.** Studies using looking-time methods — measuring how long infants stare at physically impossible events — suggest babies as young as three to four months show surprise when a hidden object behaves impossibly. This indicates some understanding much earlier than reaching behaviour showed.

The likely explanation is that Piaget's task measured several things at once: understanding, memory, attention, and the motor planning required to execute a search. A four-month-old may understand the object exists without being able to organise a retrieval.

**Why it matters practically:**

**Separation anxiety** typically emerges around the same period, and the connection is not coincidental. A baby who understands that you continue to exist elsewhere can now miss you — and cannot yet understand that you will return. This is developmental progress, not regression, though it rarely feels like it.

**Peekaboo** is genuinely fascinating to babies at this stage because the outcome is not obvious to them. Its appeal fades as the understanding consolidates.

**Hiding games** — covering a toy and encouraging searching — support it.

**Consistent goodbyes help.** Leaving without saying goodbye avoids a brief protest and undermines the predictability that eventually resolves the anxiety.

Question 2

What is theory of mind, and when does it develop?

Accepted Answer

The understanding that other people have their own beliefs, knowledge and intentions, which may differ from yours and may be wrong. Its arrival transforms a child's social world, and its absence

Question 3

When should a child start talking, and what if they're late?

Accepted Answer

The range of normal is wide, which is why general reassurance and genuine concern are both frequently misplaced. Specific milestones are more useful than averages. Rough expectations: Around 12

Question 4

Why do children copy everything you do?

Accepted Answer

Because observational learning is one of the primary mechanisms by which humans acquire behaviour, and children are unusually strongly disposed toward it — to a degree that is genuinely distinctive

Question 5

At what age do children understand that lying is wrong?

Accepted Answer

Understanding develops considerably later than the ability to lie, and the gap explains a great deal of parental confusion. When lying starts. Research by Kang Lee and colleagues, using

Question 6

What is executive function, and why do young children have so little of it?

Accepted Answer

Executive function is the set of mental processes that let you hold a goal in mind and control yourself in service of it — and children have very little of it because the brain region responsible is

Question 7

Why do children get so attached to a comfort object?

Accepted Answer

Because it does a real psychological job: it gives the child something to control when the world is not controllable, and a way to carry a sense of security into places a parent cannot go. The

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