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Episode 1

The four-year-olds take their first steps towards independence. Some are leaders. Some are mischievous. Others are more interested in buses and numbers than making friends.

The original documentary following ten four-year-olds as they meet at nursery

First shown: Tue 10 Feb 2015 | 47 mins

The Secret Life of 4 Year Olds

The four-year-olds take their first steps towards independence, and learn about friendship

First shown: Tue 3 Nov 2015 | 47 mins

4 Year Olds (2015): Episode 1

The children are joined by new faces, including Taylor, who tries to befriend the girls

First shown: Tue 10 Nov 2015 | 48 mins

4 Year Olds (2015): Episode 2

This episode meets 12 five-year-olds. Alfie and George can't agree what the sun's made of.

First shown: Thu 19 Nov 2015 | 47 mins

5 Year Olds (2015): Episode 1

Sienna captures Arthur's heart. Alfie makes a breakthrough in a painting competition.

First shown: Thu 26 Nov 2015 | 48 mins

5 Year Olds (2015): Episode 2

Topics from race to religion, love and death are up for discussion among the six-year-olds

First shown: Thu 3 Dec 2015 | 47 mins

6 Year Olds (2015): Episode 1

Caitlyn and new girl Leila bond when they try to cover up a cake mishap

First shown: Thu 10 Dec 2015 | 47 mins

6 Year Olds (2015): Episode 2

Children from the original programme and the series team up for their own Nativity play

First shown: Thu 17 Dec 2015 | 47 mins

The Secret Life of Children at Christmas

A group of four-year-olds meet for the first time and forge new friendships

First shown: Tue 8 Nov 2016 | 48 mins

4 Year Olds (2016): Episode 1

A temptation task gives new boy Kahana a chance to shine

First shown: Tue 15 Nov 2016 | 47 mins

4 Year Olds (2016): Episode 2

New five-year-olds arrive. Ellie-Mae takes Daisy, who has cerebral palsy, under her wing.

First shown: Tue 29 Nov 2016 | 47 mins

5 Year Olds (2016): Episode 1

Sensitive Nat vies for new girl Calla's attention. The class learn about competitiveness.

First shown: Tue 6 Dec 2016 | 47 mins

5 Year Olds (2016): Episode 2

This episode examines differences between boys' and girls' behaviour

First shown: Thu 2 Feb 2017 | 48 mins

5 Year Olds (Feb 2017): Episode 1

Can the boys and girls learn from each other's skills to solve a magic carpet puzzle?

First shown: Thu 9 Feb 2017 | 47 mins

5 Year Olds (Feb 2017): Episode 2

Noah is obsessed with dinosaurs and can accurately name dozens of the reptiles

First shown: Tue 7 Nov 2017 | 47 mins

4 Year Olds (Nov 2017): Episode 1

Harper, who already has several girlfriends, has his eye on confident new girl Ava

First shown: Tue 14 Nov 2017 | 46 mins

4 Year Olds (Nov 2017): Episode 2

Jack seems to be the archetypal lad, but is he using a persona to hide his sensitive side?

First shown: Tue 21 Nov 2017 | 47 mins

5 Year Olds (Nov 2017): Episode 1

Daisy struggles when new kids come to the nursery. Can she take a risk on new friendships?

First shown: Tue 28 Nov 2017 | 47 mins

5 Year Olds (Nov 2017): Episode 2

This all-girl special reveals how girls see themselves - and the role of women - in 2018

First shown: Tue 6 Feb 2018 | 47 mins

5 Year Olds (2018): All Girls

The children decide if it's ever okay to cheat, and try to reunite a divided group

First shown: Tue 8 May 2018 | 46 mins

5 Year Olds (May 2018): Episode 1

The children are given a chance to wield power. What sort of leaders do they choose to be?

First shown: Tue 15 May 2018 | 47 mins

5 Year Olds (May 2018): Episode 2

How do tablets, robots and gadgets affect how the children play and interact?

First shown: Thu 10 Jan 2019 | 46 mins

4 Year Olds (Jan 2019): Episode 1

Arthur and Iris decide to be boyfriend and girlfriend, but Frankie also likes Iris

First shown: Thu 17 Jan 2019 | 47 mins

4 Year Olds (Jan 2019): Episode 2

Syrian refugee Omar struggles to make friends. Reilly has a crush on Harlo, who's from LA.

First shown: Thu 24 Jan 2019 | 47 mins

5 Year Olds (Jan 2019): Episode 1

A seven-foot robot comes to the garden. Can the children work out how to switch it on?

First shown: Tue 29 Jan 2019 | 46 mins

5 Year Olds (Jan 2019): Episode 2

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