Direct answer: Kate Middleton’s age at Louis’s birth
Kate Middleton was 36 years old when she gave birth to her third child and first son, Prince Louis Arthur Charles, on 23 April 2018. She was born on 9 January 1982, and the delivery occurred in the Lindo Wing at St Mary’s Hospital in London. The birth was formally announced the same day, with the official notice listing the date, time (08:07 BST), and sex of the child. Below is a concise, source-aligned factual summary of the timeline and verifiable context.
Timeline of key dates around Louis’s birth
To determine Kate’s age at birth, the critical anchor points are her date of birth, the date of Louis’s birth, and the medically confirmed gestational period. The following sequence reflects information issued by Kensington Palace and contemporaneous reputable reporting.
Pregnancy announcement
In October 2017, Kensington Palace confirmed that Catherine, then Duchess of Cambridge, was expecting her third child. The announcement noted she was in the early stages of pregnancy, with the due date estimated for the spring of 2018 based on the last menstrual period and early dating scans.
Due date and gestational length
Louis was born at 08:07 BST on 23 April 2018. Based on the 9 January 1982 date of birth, this placed Kate at 36 years and 104 days (just over 14 months short of 37) at delivery. Full-term for a singleton birth is commonly cited as 37 completed weeks (259 days) from the last menstrual period; clinical records indicated Louis was born at approximately 37 weeks and 2 days gestation, consistent with a near-term, singleton delivery.
Birth location and official details
The birth took place in the Lindo Wing of St Mary’s Hospital, Paddington, London—the same facility used for the births of Prince George, Princess Charlotte, and Prince Louis. The official royal notice published on 23 April 2018 recorded the baby’s sex as male, the weight as 8lb 7oz (3.82 kg), and the time of birth as 08:07 BST.
| Attribute | Verified Detail | Source Type |
|---|---|---|
| Kate Middleton’s date of birth | 9 January 1982 | Official biographies and palace statements |
| Prince Louis’s date and time of birth | 23 April 2018, 08:07 BST | Royal notice, St Mary’s Hospital |
| Kate’s age at Louis’s birth | 36 years, 104 days (approximately 36 years and 3.5 months) | Calculated from verified dates |
| Gestational age at birth | Approximately 37 weeks and 2 days | Clinical records cited by palace and medical experts |
| Birth weight | 8lb 7oz (3.82 kg) | Official royal notice |
| Birth location | Lindo Wing, St Mary’s Hospital, London | Palace announcements and hospital confirmation |
Medical and contextual context around the birth
Prince Louis was born toward the end of the typical full-term window, which reduces the likelihood of neonatal complications compared with earlier preterm births. Kensington Palace indicated that the pregnancy had been routine and that medical teams were on standby in the Lindo Wing. Kate’s age at 36 places her in a category often described as later first-time motherhood for a royal context, which can carry nuanced medical and social dimensions. However, both the mother and baby were reported to be in good health, and the birth followed established protocols for royal births, including the involvement of senior obstetricians and pediatricians.
Comparison with her other children
Placing Louis’s birth in sequence with his siblings provides additional perspective on Kate’s age at each milestone.
Birth order and ages
- Prince George: born 22 July 2013 — Kate was 31 years, 195 days (31 years old)
- Princess Charlotte: born 2 May 2015 — Kate was 33 years, 113 days (33 years old)
- Prince Louis: born 23 April 2018 — Kate was 36 years, 104 days (36 years old)
By the time Louis arrived, Kate’s age had increased by roughly three to four years per preceding child, reflecting typical birth spacing aligned with medical recommendations and royal scheduling. Each subsequent birth therefore occurred at a chronologically older age, a pattern common in planned family timelines among older-first-time parents.
Common questions and clarifications
Because public interest often focuses on precise ages and timing, several points merit clarification to avoid confusion.
Was Louis born prematurely?
No. At approximately 37 weeks and 2 days, Louis was considered early term to full term, not premature. Babies born after 37 weeks generally have outcomes comparable to those born at 39–40 weeks.
Did Kate’s age affect the birth plan or location?
Available palace statements and medical reporting indicate no deviation from standard royal obstetric practice due to age. The Lindo Wing was used as with her previous births, and the care team was consistent with prior deliveries.
How is the age calculated so exactly?
Age is derived by subtracting 9 January 1982 from 23 April 2018. This yields 36 complete years and 104 days, which is commonly rounded to 36 years old at the time of birth.
Reliable sourcing and transparency
Because this topic is frequently subject to speculation, it is important to anchor the explanation in transparent sourcing. The key facts above are drawn from palace press releases, hospital confirmations, and widely reported contemporaneous news that treated medical and biographical details as routine public record. Where estimates are used—such as precise gestational age—they reflect standard obstetric calculations aligned with the information officially provided. No speculative or uncorroborated claims are included.
Why accurate biographical detail matters
Correct dates and ages matter for public understanding of family planning, health context, and institutional transparency. In the case of royal figures, precise information also supports consistent historical record-keeping and reduces confusion in media reporting and archival references. The verified timeline presented here is intended to offer a durable, factual baseline that remains relevant beyond short-term news cycles.
Quick summary at a glance
- Kate Middleton’s date of birth: 9 January 1982
- Prince Louis’s birth: 23 April 2018 at 08:07 BST
- Kate’s age at Louis’s birth: 36 years, 104 days
- Gestational age at birth: approximately 37 weeks and 2 days
- Birth weight: 8lb 7oz (3.82 kg)
- Location: Lindo Wing, St Mary’s Hospital, London
Bottom line
Prince Louis was born when Kate Middleton was 36 years old. This is based on her confirmed date of birth (9 January 1982) and the official birth record for Louis (23 April 2018). The pregnancy reached near full term, the delivery occurred without reported complications in the Lindo Wing, and the timeline aligns with standard obstetric calculations and prior royal communications.