Timeline

### Birth

* 0 – 6 weeks – Reflexive vocalizations, vegetative sounds (Yeni-Komshian, 1980:74)
* 6- 16 weeks – Cooing (Yeni-Komshian, 1980:74)
* 16 weeks – Laughing (Hoff, 2010)
* 16 – 30 weeks – vocal play (Yeni-Komshian, 1980:74)

### 6 months

* 6 month olds – only phoneticians could distinguish French babbling (Lust, B. 2006:152)
* 6 – 10 months – reduplicated babbling (Yeni-Komshian 1980:75)
* 8 months old – French adults could distinguish French babbling from French/Arabic babbling (75.8%) and French/Cantonese babbling (69.8%). (Lust, B. 2006:152)
* 10 – 14 months – Nonreduplicated babbling (Yeni-Komshian 1980:75)
* 11 months – distinguished passages with modified and unmodified function words (Lust, B. 2006:193)
* 0;11 – voiced labial stops (Yeni Komshian et al, 1980:151)

### 12 months

* 1;1 – dental voiced stops (Yeni Komshian et al, 1980:151)
* 1;1.3 – Agents of Actions (Clark, 2009:73/130 (Part 2))
* 1;1.16 – Actions of states associated with agents and objects (Clark, 2009:73/130 (Part 2))
* 15 – 30 months (MLU 1.75) – Stage One of Brown's Language Development (Brown, 1973)
* 1;3 – 2;0 – telegraphic directives. That mine. Gimme. More cookie. (Stilwell-Peccei, 2006:31 (e44))
* 16 months – distinguish grammatical from ungrammatical function morphemes (Lust, B. 2006:193)
* 1;4.19 – Objects affected (Clark, 2009:73/130 (Part 2))
* 18 months – can track relationships between function morphemes (Lust, B. 2006:193)
* 18 months - Combinatorial speech emerges (Rodgon, 2009)
* 22 months – two objects, one label (Gillen, 2003)

### 2 years

* 2;0 – 2;4 – Limited routines: Where's my X/What's that?/Is there X?/I need X (all meaning "Give me X".) Stilwell-Peccei, 2006:31 (e44)
* 28 – 36 months (MLU 2.25) – Stage Two of Brown's Language Development (Brown, 1973)
* 2;4 – 3;8 – Embedded requests: Can I have big boy shoes? Could you give me one? Stilwell-Peccei, 2006:31 (e44)
* 2;5 – 4+ – Hints: I can`t do it, Daddy (ie "Do it for me"). Stilwell-Peccei, 2006:31 (e44)
* 2 ½: babble up until now (Clark, 2003:104)

### 3 years

* By 3 years: most of the adult timing rules (MacNeilage, 1980:19)
* 36 – 42 months (MLU 2.75) – Stage Three of Brown's Language Development (Brown, 1973)
* 40 – 46 months (MLU 3.5) – Stage Four of Brown's Language Development (Brown, 1973)
* 42 – 53 months (MLU 4.0) – Stage Five of Brown's Language Development (Brown, 1973)
* 3;8 – 5;7 – Advanced embedding: Don't forget to buy candy. Why don't you buy some candy? Stilwell-Peccei, 2006:31 (e44)

### 4+

* 4+ – Elaborate oblique strategies (desire mentioned): we haven`t had any candy for a long time Stilwell-Peccei, 2006:31 (e44)
* 5+ – Elaborate oblique strategies (desire not mentioned): an example of this would be Sophie`s Machiavellian approach in the Ì`ve got a headache`conversation above. It is only under questioning from her mother that she reveals her real reason for asking for cucumber for lunch Stilwell-Peccei, 2006:31 (e44)

## Vague

* In early stages of development, frequently omit inversion of subject & verb, signalling a question with rising intonation only (the skunk was black? Instead of Was the skunk black?) (Klima & Bellugi, 1973) (Goodluck, H. 2001:34)

## Sources

Maris Monitz Rodgon, 2009. http://www.cambridge.org/ca/academic/subjects/languages-linguistics/psycholinguistics-and-neurolinguistics/single-word-usage-cognitive-development-and-beginnings-combinatorial-speech-study-ten-english-speaking-children

http://www.medicinenet.com/script/main/art.asp?articlekey=6210

* **Lanugo:** Downy hair on the body of a fetus or newborn baby. Lanugo is the first hair to be produced by the fetal hair follicles, and it usually appears on the fetus at about 5 months of gestation. Lanugo is very fine, soft, and usually unpigmented. Although lanugo is normally shed before birth, around 7 or 8 months of gestation, it is sometimes present at birth. This is not a cause for concern: Lanugo disappears of its own accord within a few days or weeks.